| RO-30 呂30 ロ30 | |
| Type (Class): KT (RO-29) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 1922 Program: | 1921 |
| Laid Down | | 27.06.1921 |
| Launched as Submarine No. 69 | | 18.01.1923 |
| Completed: | | 29.04.1924 |
| Renamed RO-30 | | 01.11.1924 |
| Service: | | |
| Sasebo ND | | 29.04.24–01.06.24 |
| SubDiv 25, Mako Defence Div., Sasebo ND | 01.06.24–01.12.26 |
| SubDiv 25, Sasebo Defence Div., Sasebo ND | 01.12.26–15.11.34 |
| SubDiv 25, Sasebo ND (training submarine) | 15.11.34–15.12.38 |
| SubDiv 25, 4th Reserve, Sasebo ND | 15.12.38–01.04.42 |
Fate: Became a stationery training hulk at the Otake Submarine School as of 01.04.42. Broken up 08.45. |
| Removed from Navy List: | | 01.04.1942 |
| Commanding Officers: | | |
| Lt Yoshitomi Setsuzo (39) | 吉富説三 | 01.02.23–01.12.25 |
| ? | | ? |
| LtCdr Yamada Takashi (49) | 山田 隆 | 01.12.31–20.03.34 |
Lt Emi Tetsushiro (50)
Lt Emi commanded RO-31 simulaneously. | 江見哲四郎 | 20.03.34–01.11.34 |
| ? | | 01.11.34–? |
| No commander appointed | | 01.04.38–01.04.42 |
| RO-31 呂31 ロ31 | |
| Type (Class): KT (RO-29) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 1922 Program: | | 1921 |
| Laid Down | | 25.09.1921 |
| Launched as Submarine No. 70: | | 15.02.1923 |
Fate: Swamped by a passing boat and sank due to open hatch 21.08.23 during trails before completion off Awaji Island, Osaka Bay Kobe; Japan. 88 dead; 5 saved. |
| Salvaged: | | 11.1924 |
| Launched for the second time as RO-31: | | 25.09.1926 |
| Completed: | | 10.05.1927 |
| Service: | | |
| Sasebo ND | | 25.09.26–15.11.34 |
| SubDiv.25, Sasebo ND | | 15.11.34–15.12.38 |
| SubDiv.25, 4th Reserve, Sasebo ND | | 15.12.38–09.02.42 |
| Kure ND | | 09.02.42–14.07.42 |
| Yokosuka ND | | 14.07.42–15.01.43 |
| Kure ND | | 15.01.43–31.01.44 |
| 4th Reserve, Kure ND | | 31.01.44–25.05.45 |
Fate: 02.09.45 surrendered at Sasebo. Scuttled 05.04.46 at Sasebo. |
| Removed from Navy List | | 25.05.1945 |
| Commanding Officers: | | |
| *LtCdr Kamihayashi Kiyoshi (34) | | 1923–21.08.23 |
| ? | | 25.09.26–05.11.26 |
| LtCdr Yoshitomi Setsuzo (39) | | 05.11.26–10.05.27 |
| LtCdr Yoshitomi Setsuzo (39) | | 10.05.27–16.05.28 |
| LtCdr Nakajima Chihiro (43) | | 16.05.28–01.11.29 |
| ? | | ? |
Lt Emi Tetsushiro (50) [1]
Lt Emi commanded RO-30 simulaneously. | 江見哲四郎 | 20.03.34–01.11.34 |
| ? | | ? |
| Lt Shimose Yoshiro (Kichiro) (58) | 下瀬吉郎 | 31.01.42–30.06.42 |
| Lt Hashimoto Mochitsura (59) | 橋本以行 | 30.06.42–02.43 |
| ? | | 02.43–16.03.42 |
| Lt Nakamura Motoo (62) | 中村元夫 | 16.03.43–12.06.43 |
| Lt.Cdr.Kobayashi Hinomoto (0) | 小林日本 | 12.06.43–01.07.43 |
| Cdr Kamimoto Nobuo (56) | 神本信雄 | 01.07.43–31.01.44 |
| ? | | ? |
| RO-32 呂32 ロ32 |
| Type (Class): KT (RO-29) | | |
| Call Sign: JTFP | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 1922 Program: | | 1921 |
| Laid Down: | | 24.10.1921 |
| Launched as Submarine No. 71: | | 19.03.1923 |
| Completed: | | 31.05.1924 |
| Renamed RO-32: | | 01.11.1924 |
| Service: | | |
| SubDiv 25, Sasebo Defence Div, Sasebo ND | 01.12.26–15.11.34 |
| SubDiv 25, Sasebo ND | | 15.11.34–15.12.38 |
| SubDiv 25, 4th Reserve, Kure ND | | 15.12.38–01.04.42 |
| Removed from Navy List | | 01.04.1942 |
Fate: Became a stationery training hulk at the Otake Submarine School on 01.04.42. Broken up 08.45. |
| Commanding Officers: | | |
| LtCdr Miyoshi Teruhiko (43) | 三好輝彦 | 01.08.25–01.12.27 |
| ? | | ? |
| LtCdr Yamada Takeshi (49) | 山田 隆 | 06.09.33–20.03.34 |
| Lt Emi Tetsushiro (50) | 江見哲四郎 | 20.03.34-01.11.34 |
| ? | | ? |
| RO-33 呂33 ロ33 | | |
| Type (Class): K5 (RO-33) | | |
| Call Sign: JTGP | | |
| Builder: Kure Navy Yard | | |
| Ordered: | | 1931 |
| Laid Down: | | 08.08.1933 |
| Launched: | | 10.10.1934 |
| Completed: | | 07.10.1935 |
| Service: | | |
| Sasebo ND | | 07.10.35–31.05.37 |
| SubDiv 21, Sasebo ND | | 31.05.37–15.12.38 |
| SubDiv 21, Combined Fleet | | 15.12.38–08.04.39 |
| SubDiv 21, 2nd SubRon, 2ndFleet | | 08.04.39–15.11.39 |
| SubDiv 21, 2nd Reserve, Sasebo ND | | 15.11.39–01.05.40 |
| SubDiv 21, 5th SubRon, 4th Fleet | | 01.05.40–15.11.40 |
| SubDiv 21, 4th SubRon, Combined Fleet | | 15.11.40–10.03.42 |
| SubDiv 21, 6th SubRon, Combined Fleet | | 10.03.42–10.04.42 |
| SubDiv 21, 7th SubRon, 4th Fleet | | 10.04.42–14.07.42 |
| SubDiv 21, 7th SubRon, 8th Fleet | | 14.07.42–05.10.42 |
Fate: Sunk 29.08.42 at 13:05 by HMAS Arunta 10 miles SE of Port Moresby (09°36'S, 147°06'E). 70 dead; 0 saved. |
| Removed from Navy List | | 05.10.1942 |
| Commanding Officers: | | |
| LtCdr Ishikawa Nobuo (49) | 石川信雄 | 07.10.35–15.02.36 |
| LtCdr Ageta Kiyoi (50) | 揚田清猪 | 15.02.36–20.03.37 |
| LtCdr Shibuya Tatsuwaka (52) | 渋谷竜? | 20.03.37–20.06.37 |
| LtCdr Ariizumi Tatsunosuke (51) | 有泉竜之助 | 20.06.37–15.10.39 |
| = also written Ariizumi Ryunosuke | | |
LtCdr Isobe Akira (52)
= also written Ichikawa Akira | 磯部 旦 | 15.10.39–20.03.40 |
| LtCdr Ohira Masajiro (52) | 大平政二郎 | 20.03.40–30.10.40 |
| LtCdr Watanabe Katsuji (55) | 渡辺勝次 | 30.10.40–31.07.41 |
| LtCdr Sakamoto Eiichi (57) | 坂本栄一 | 31.07.41–18.04.42 |
| *LtCdr Kuriyama Shigeshi (58) | 栗山重志 | 18.04.42–29.08.42 |
| RO-34 呂34 ロ34 | | |
| Type (Class): K5 (RO-33) | | |
| Call Sign: JTHP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered: | | 1931 |
| Laid Down: | | 25.04.1934 |
| Launched: | | 12.12.1935 |
| Completed: | | 31.05.1937 |
| Service: | | |
| SubDiv 21, Sasebo ND | | 31.05.37–15.12.38 |
| SubDiv 21, Combined Fleet | | 15.12.38–08.04.39 |
| SubDiv 21, 2nd SubRon, 2ndFleet | | 08.04.39–15.11.39 |
| SubDiv 21, 2nd Reserve, Sasebo ND | | 15.11.39–01.05.40 |
| SubDiv 21, 5th SubRon, 4th Fleet | | 01.05.40–15.11.40 |
| SubDiv 21, 4th SubRon, Combined Fleet | | 15.11.40–10.03.42 |
| SubDiv 21, SubRon 6, Combined Fleet | | 10.03.42–10.04.42 |
| SubDiv 21, 7th SubRon, 4th Fleet | | 10.04.42–14.07.42 |
| SubDiv 21, 7th SubRon, 8th Fleet | | 14.07.42–05.10.42 |
| 7th SubRon, 8th Fleet | | 05.10.42–24.12.42 |
| 7th SubRon, 8th Fleet, SE Area Fleet | | 24.12.42–04.03.43 |
| SubDiv 13, 7th SubRon, 8th Fleet, SE Area Fleet | 04.03.43–15.07.43 |
Fate: Sunk 05.04.43 at 03:19 by USS O'Bannon (DD-450) 40 miles off Russell Islands (08°15'S, 158°58'E). 66 dead; 0 saved. |
| Removed from Navy List | | 15.07.1943 |
| Commanding Officers: | | |
| LtCdr Tonozuka Kinzo (50) | 殿塚謹三 | 31.05.37–15.11.37 |
| LtCdr Hirokawa Takashi (51) | 広川 隆 | 15.11.37–19.03.38 |
LtCdr Narusawa Sennao (52)
= also written Narusawa Sunao | 成沢千直 | 19.03.38–15.09.38 |
| LtCdr Asada Shiroku (54) | 朝田肆六 | 15.09.38–05.11.39 |
| LtCdr Fukumura Toshiaki (54) | 福村利明 | 15.11.39–05.11.40 |
| LtCdr Kinashi Takakazu (51) | 木梨鷹一 | 05.11.40–30.06.41 |
| LtCdr Ota Takeshi (55) | 大田 武 | 01.07.41–05.06.42 |
| LtCdr Morinaga Masahiko (59) | 森永正彦 | 05.06.42–30.10.42 |
| LtCdr Doi Mareshige (60) | 土居誉重 | 30.10.19–30.03.43 |
| *LtCdr Tomita Rikichi (61) | 富田理吉 | 30.03.42–05.04.43 |
| RO-35 呂35 ロ35 | | |
| Call Sign: | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 09.10.1941 |
| Launched: | | 04.06.1942 |
| Completed: | | 31.03.1943 |
| Service: | | |
| Kure SubRon, Kure ND | | 25.03.43–01.04.43 |
| 11th SubRon, 1st Fleet | | 01.04.43–20.07.43 |
| 6th Fleet | | 20.07.43–31.10.43 |
| SubDiv 34, 6th Fleet | | 31.10.43–01.12.43 |
Fate: Sunk 25.08.43 at 21:53 by USS Patterson (DD-392) 170 miles E of Santa Cruz, Solomons (12°57'S, 164°23'E). 66 dead; 0 saved. |
| Removed from Navy List | | 01.12.1943 |
| Commanding Officers: | | |
| *LtCdr Manabe Masateru (60) | 真鍋正輝 | 05.11.42–25.08.43 |
| RO-36 呂36 ロ36 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 07.03.1942 |
| Launched: | | 14.10.1942 |
| Completed: | | 27.05.1943 |
| Service: | | |
| Maizuru ND | | 27.05.43–31.05.43 |
| 11th SubRon, 1st Fleet | | 31.05.43–20.08.43 |
| 6th Fleet | | 20.08.43–31.10.43 |
| SubDiv 34, 6th Fleet | | 31.10.43–10.08.44 |
Fate: Sunk 13.06.44 by USS Melvin (DD-680) 75 miles E of Saipan (15°21'N, 147°00'E). 77 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| LtCdr Okada Hideo (61) | 岡田英雄 | 27.05.43–01.02.44 |
| *LtCdr Kawashima Tatsuo (64) | 川島立男 | 01.02.44–13.06.44 |
| RO-37 呂37 ロ37 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 09.10.1941 |
| Launched: | | 30.06.1942 |
| Completed: | | 30.06.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 30.06.43–16.09.43 |
| 6th Fleet | | 16.09.43–31.10.43 |
| SubDiv 34, 6th Fleet | | 31.10.43–30.04.44 |
Fate: Sunk 22.01.44 by USS Buchanan (DD-484) off San Christobal Island (11°47'S, 164°17'E). 61 dead; 0 saved. |
| Removed from Navy List | | 30.04.1944 |
| Commanding Officers: | | |
| *LtCdr Sato Sakuma (60) | 佐藤作馬 | 10.12.43–22.01.44 |
| RO-38 呂38 ロ38 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 20.06.1942 |
| Launched: | | 24.12.1942 |
| Completed: | | 24.07.1943 |
| Service: | | |
| Maituru ND | | 24.07.43–31.07.43 |
| 11th SubRon, 1st Fleet | | 31.07.43–31.10.43 |
| SubDiv 34, 6th Fleet | | 31.10.43–30.04.44 |
Fate: Sunk 02.01.44 (unknown cause) off Gilbert Islands. 77 died, 0 saved. |
| Removed from Navy List | | 30.04.1944 |
| Commanding Officers: | | |
| *LtCdr Nomura Shunji (60) | 野村俊治 | 25.05.43–02.01.44 |
| RO-39 呂39 ロ39 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Sasebo Navy Yard | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 08.08.1942 |
| Launched: | | 06.03.1943 |
| Completed: | | 12.09.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 12.09.43–25.11.43 |
| 11th SubRon, 6th Fleet | | 25.11.43–25.12.43 |
| SubDiv 34, 6th Fleet | | 25.12.43–30.04.44 |
Fate: Sunk 02.02.44 by USS Walker (DD-517) off Wotje (09°24'N, 170°32'E). 70 dead; 0 saved. |
| Removed from Navy List | | 30.04.1944 |
| Commanding Officers: | | |
| *LtCdr Tategami Rikuta (60) | 館上陸太 | 31.07.43–02.02.44 |
| RO-40 呂40 ロ40 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 08.08.1942 |
| Launched: | | 06.03.1943 |
| Completed: | | 28.09.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 28.09.43–25.11.43 |
| 11th SubRon, 6th Fleet | | 25.11.43–15.01.44 |
| SubDiv 34, 6th Fleet | | 15.01.44–30.04.44 |
Fate: Sunk 16.02.44 by USS Phelps (DD-360) 45 miles NW of Kwajalein (09°50'N, 166°35'E). 69 dead; 0 saved. |
| Removed from Navy List | | 30.04.1944 |
| Commanding Officers: | | |
| *LtCdr Kudo Yasuo (60) | 城戸保雄 | 28.09.43–16.02.44 |
| RO-41 呂41 ロ41 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 06.10.1942 |
| Launched: | | 05.05.1943 |
| Completed: | | 26.11.1943 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 26.11.43–05.03.44 |
| SubDiv 34, 6th Fleet | | 05.03.44–25.05.45 |
Fate: Sunk 23.03.45 by USS Haggard (DD-555) SE of Okinawa (22°57'N, 132°19'E). 81 dead; 0 saved. |
| Removed from Navy List | | 25.05.1945 |
| Commanding Officers: | | |
| LtCdr Sakamoto Kaneyoshi (61) | 坂本金美 | 25.09.43–05.07.44 |
| Lt Shiizuka Mitsuo (66) | 椎塚三夫 | 05.07.44–01.02.45 |
| *Lt Honda Yoshikuni (67) | 本多義邦 | 01.02.45–23.03.45 |
| RO-42 呂42 ロ42 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Sasebo Navy Yard | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 27.04.1942 |
| Launched: | | 25.10.1942 |
| Completed: | | 27.08.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 30.09.43–25.11.43 |
| 11th SubRon, 6th Fleet | | 25.11.43–30.11.43 |
| SubDiv 34, 6th Fleet | | 30.11.43–10.08.44 |
Fate: Sunk 11.06.44 by USS Bangust (DE-739) 40 miles E of Roi (10°05'N, 168°22'E). 73 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| LtCdr Wada Mutsuo (61) | 和田睦雄 | 25.06.43–14.05.44 |
| *Lt Kudo Yoshinosuke (66) | 工藤芳之助 | 14.05.44–11.06.44 |
| RO-43 呂43 ロ43 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 06.10.1942 |
| Launched: | | 05.06.1943 |
| Completed: | | 16.12.1943 |
| 11th SubRon, 6th Fleet | | 16.12.43–10.03.44 |
| SubDiv 34, 6th Fleet | | 10.03.44–10.04.45 |
Fate: Sunk 26.02.45 at 02:20 by aircraft of VC-82 from USS Anzio (CVE-57) (24°07'N, 140°19'E). 79 dead; 0 saved. |
| Removed from Navy List | | 10.04.1945 |
| Commanding Officers: | | |
| Lt Nishimatsu Haruo (60) | 西松張尾 | 16.12.43–05.05.44 |
| *Lt Tsukigata Masaki (66) | 月形正気 | 05.05.44–26.02.45 |
| RO-44 呂44 ロ44 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Tamano Heavy Industries, Tamano | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 14.02.1942 |
| Launched: | | 11.11.1942 |
| Completed: | | 19.09.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 13.09.43–25.11.43 |
| 11th SubRon, 6th Fleet | | 25.12.43–25.12.43 |
| SubDiv 34, 6th Fleet | | 25.12.43–10.08.44 |
Fate: Sunk 16.06.44 by USS Burden R Hastings (DE-19) 110 miles E of Eniwetok (11°13'N, 164°15'E). 72 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| LtCdr Hashimoto Mochitsura (59) | 橋本以行 | 25.07.43–14.05.44 |
| *LtCdr Uesugi Sadao (65) | 上杉貞夫 | 14.05.44–16.06.44 |
| RO-45 呂45 ロ45 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 20.10.1942 |
| Launched: | | 21.07.1943 |
| Completed: | | 11.01.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 11.01.44–15.04.44 |
| SubDiv 34, 6th Fleet | | 15.04.44–10.07.44 |
Fate: Sunk 30.04.44 by USS MacDonough (DD-351) 40 miles S of Truk (06°13'N, 151°19'E). 74 dead; 0 saved. |
| Removed from Navy List | | 10.07.1944 |
| Commanding Officers: | | |
| *LtCdr Hamazumi Yoshihisa (61) | 浜住芳久 | 11.01.44–30.04.44 |
| RO-46 呂46 ロ46 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 13.06.1942 |
| Launched: | | 23.04.1943 |
| Completed: | | 19.02.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 19.02.44–23.06.44 |
| SubDiv 34, 6th Fleet | | 23.06.44–10.06.45 |
Fate: Sunk 29.04.45 by aircraft of VC-92 from USS Tulagi (CVE-72) off Okinawa (02°17'S, 149°14'E). 86 dead; 0 saved. |
| Removed from Navy List | | 10.06.1945 |
| Commanding Officers: | | |
| LtCdr Suzuki Shokichi (62) | 鈴木正吉 | 20.01.44–08.12.44 |
| Lt Tokunaga Masahiko (67) | 徳永正彦 | 08.12.44–18.03.45 |
*LtCdr Kimura Masuo (63)
= also written Kimura Masao | 木村正男 | 18.03.45–29.04.45 |
| RO-47 呂47 ロ47 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Tamano Heavy Industries, Tamano | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 28.12.1942 |
| Launched: | | 30.08.1943 |
| Completed: | | 31.01.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 31.01.44–14.05.44 |
| SubDiv 34, 6th Fleet | | 14.05.44–10.03.45 |
Fate: Sunk 26.09.44 at 06:15 by USS McCoy Reynolds, (DE-440) NE of Palau (09°19'N, 136°44). 76 dead; 0 saved. |
| Removed from Navy List | | 10.03.1945 |
| Commanding Officers: | | |
| LtCdr Nishiuchi Shoichi (60) | 西内正一 | 20.12.43–31.07.44 |
| *Lt Ishikawa Nagao (65) | 石川長男 | 31.07.44–26.09.44 |
| RO-48 呂48 ロ48 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 17.03.1942 |
| Launched: | | 15.10.1943 |
| Completed: | | 31.03.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 31.03.44–03.07.44 |
| SubDiv 34, 6th Fleet | | 03.07.44–10.10.44 |
Fate: Sunk 14.07.44 by USS Wyman (DE-38) 300 miles E of Saipan (13°01'N, 151°58'E). 76 dead; 0 saved. |
| Removed from Navy List | | 10.10.1944 |
| Commanding Officers: | | |
| *LtCdr Ichitomi Kiyota (63) | 一冨清太 | 31.03.44–14.07.44 |
| RO-49 呂49 ロ49 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Tamano Heavy Industries, Tamano | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 16.11.1942 |
| Launched: | | 03.08.1943 |
| Completed: | | 19.05.1944 |
| Service: | | |
| SubDiv 33, Kure SubRon, Kure ND | | 19.05.44–15.08.44 |
| 11th SubRon, 6th Fleet | | 15.08.44–10.11.44 |
| SubDiv 34, 6th Fleet | | 10.11.44–25.05.45 |
Fate: fate: Sunk 05.04.45 by USS Hudson (DD-475) off Kume Jima, Okinawa (26°22'N, 126°30'E). 79 dead; 0 saved. |
| Removed from Navy List | | 25.05.1945 |
| Commanding Officers: | | |
| LtCdr Fumon Shozo (63) | 普門正三 | 01.04.44–26.05.44 |
| Capt Otani Kiyonori (49) | 大谷清教 | 27.05.44–09.07.44 |
| LtCdr Oba Saichi (62) | 大場佐一 | 10.07.44–04.08.44 |
| LtCdr Sugamasa Tetsuaki (65) | 菅昌徹昭 | 05.08.44–04.02.45 |
| *LtCdr Go Yasuo (66) | 郷 康夫 | 05.02.45–05.04.45 |
| RO-50 呂50 ロ50 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Tamano Heavy Industries, Tamano | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 18.02.1943 |
| Launched: | | 27.11.1943 |
| Completed: | | 31.07.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 31.07.44–05.11.44 |
| SubDiv 34, 6th Fleet | | 05.11.44–15.08.45 |
| SubDiv 15, 6th Fleet | | 15.08.45–02.11.45 |
| post-war US Navy's Japanese Submarine Division Four | 02.11.45–30.11.45 |
Fate: 02.09.45 surrendered at Maizuru. Scuttled 01.04.46 off Goto Is. (32°37'N, 129°17'E). |
| Removed from Navy List | | 30.11.1945 |
| Commanding Officers: | | |
| LtCdr Kimura Masuo (63) | 木村正男 | 05.06.44–19.03.45 |
| Vacant [?] | | 19.03.45–02.04.45 |
| Lt Imai Umeichi (67) | 今井梅一 | 02.04.45–30.11.45 |
| RO-55 呂55 ロ55 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Tamano Heavy Industries, Tamano | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 05.08.1943 |
| Launched: | | 23.04.1944 |
| Completed: | | 30.09.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 30.09.44–04.01.45 |
| SubDiv 34, 6th Fleet | | 04.01.45–10.05.45 |
Fate: Sunk 07.02.45 at 23:30 by USS Thomason (DE-203) off Iba, Luzon (15°27'N, 119°25'E). 80 dead; 0 saved. |
| Removed from Navy List | | 10.05.1945 |
| Commanding Officer | | |
| *Lt Suwa Koichiro (64) | 諏訪幸一郎 | 30.09.44–07.02.45 |
| RO-56 呂56 ロ56 | | |
| Type (Class): K6 (RO-35) | | |
| Builder: Tamano Heavy Industries, Tamano | | |
| Ordered under 1940 Urgent War Program: | | 1941 |
| Laid Down: | | 02.12.1943 |
| Launched: | | 05.07.1944 |
| Completed: | | 15.11.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 15.11.44–20.02.45 |
| SubDiv 34, 6th Fleet | | 10.02.45–24.05.45 |
Fate: Sunk 09.04.45 by USS Monnsen (DD-691) off Okinodaito Jima (26°09'N, 130°21'E). 79 dead; 0 saved. |
| Removed from Navy List | | 24.05.1945 |
| Commanding Officers: | | |
| *Lt Nagamatsu Masateru (67) | 永松正輝 | 15.11.44–09.04.45 |
| RO-57 呂57 ロ57 | | |
| Type (Class): L3 (RO-57) | | |
| Call Sign: JUEP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1920 Program: | | 1918 |
| Laid Down: | | 20.11.1920 |
| Launched: | | 03.12.1921 |
| Completed: | | 20.07.1922 |
| Service: | | |
| Yokosuka ND | | 30.07.22–01.12.22 |
| SubDiv 6, 1st SubRon, 1st Fleet | | 01.12.22–01.08.26 |
| SubDiv 6, 2nd SubRon, 2nd Fleet | | 01.08.26–01.12.26 |
| SubDiv 6, Yokosuka ND | | 01.12.26–01.12.27 |
| SubDiv 6, Yokosuka Defence Div, Yokosuka ND | 01.12.27–30.11.29 |
| SubDiv 6, Yokosuka ND | | 30.11.29–01.12.30 |
| SubDiv 6, Yokosuka Defence Div, Yokosuka ND | 01.12.30–11.12.33 |
| SubDiv 6, Yokosuka Guard Sqdn, Yokosuka ND | 01.12.33–22.04.34 |
| SubDiv 6, Yokosuka Defence Div, Yokosuka ND | 22.04.34–15.06.34 |
| SubDiv 6, Yokosuka Guard Sqdn, Yokosuka ND | 15.06.34–15.11.34 |
| SubDiv 6, Yokosuka ND | | 15.11.34–01.11.38 |
| SubDiv 6, 2nd Reserve, Yokosuka ND | | 01.11.38–01.04.39 |
| SubDiv 6, Gunnery School, Yokosuka ND | 01.04.39–01.11.41 |
| SubDiv 6, Kure ND | | 01.11.41–15.01.43 |
| SubDiv 6, Yokosuka ND | | 15.01.43–01.05.45 |
| Kure ND, 6th Fleet | | 01.05.45–15.08.45 |
Fate: On 01.05.45 became a stationery training hulk at Kure. 02.09.45 surrendered. Scrapped 1946. |
| Removed from Navy List | | 01.05.1945 |
| Commanding Officers: | | |
| Lt Morino Sorokuro (40) | 森野草六郎 | 30.05.24–01.12.25 |
| LtCdr Mori Tokuji (40) | 森 徳治 | 01.12.25–10.12.28 |
| ? | | ? |
| Cdr Sato Torajiro (43) | 佐藤寅治郎 | 01.11.29–10.09.31 |
| LtCdr Miyazaki Takeji (46) | 宮崎武治 | 10.09.31–21.01.33 |
| ? | | ? |
| LtCdr Fujii Akiyoshi (49) | 藤井明義 | 25.03.33–28.02.35 |
| ? | | ? |
| LtCdr Nagai Katsuhiko (57) | 長井勝彦 | –10.02.42 |
| ? | | ? |
| Capt Narahara Shogo (48) | 楢原省吾 | 18.05.43–01.09.43 |
| Capt Shichiji Tsuneo (49) | 七字恒雄 | 01.09.43–17.03.45 |
| LtCdr Kawaguchi Genbei (66) | 川口源兵衛 | 17.03.45–15.08.45 |
| RO-58 呂58 ロ58 | | |
| Type (Class): L3 (RO-57) | | |
| Call Sign: JUFP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1920 Program: | | 1918 |
| Laid Down: | | 15.02.1921 |
| Launched: | | 02.03.1922 |
| Completed: | | 25.11.1922 |
| Service: | | |
| Yokosuka ND | | 25.11.22–01.12.22 |
| SubDiv 6, 1st SubRon, 1stFleet | | 01.12.22–01.08.26 |
| SubDiv 6, 2nd SubRon, 2nd Fleet | | 01.08.26–01.12.26 |
| SubDiv 6, Yokosuka ND | | 01.12.26–01.12.27 |
| SubDiv 6, Yokosuka Defence Div, Yokosuka ND | 01.12.27–30.11.29 |
| SubDiv 6, Yokosuka ND | | 30.11.29–01.12.30 |
| SubDiv 6, Yokosuka Defence Div, Yokosuka ND | 01.12.30–11.12.33 |
| SubDiv 6, Yokosukauard Sqdn, Yokosuka ND | 01.12.33–22.04.34 |
| SubDiv 6, Yokosuka Defence Div, Yokosuka ND | 22.04.34–15.06.34 |
| SubDiv 6, YokosukaGuard Sqdn, Yokosuka ND | 15.06.34–15.11.34 |
| SubDiv 6, Yokosuka ND | | 15.11.34–31.07.37 |
| Gunnery School, Yokosuka ND | | 31.07.37–01.04.39 |
| SubDiv 6, Gunnery School, Yokosuka ND | | 01.04.39–01.11.41 |
| SubDiv 6, Kure NDF | | 01.11.41–15.01.43 |
| SubDiv 6, Yokosuka ND | | 15.01.43–01.05.45 |
| 4th Reserve, Kure ND, 6th Fleet (Hulked) | 01.05.45–15.08.45 |
Fate: On 01.05.45 became a stationery training hulk at Kure. 02.09.45 surrendered. Scrapped 1946. |
| Removed from Navy List | | 01.05.1945 |
| Commanding Officers: | | |
| LtCdr Wakabayashi Seisaku (39) | 若林清作 | 01.12.23–01.12.25 |
| LtCdr Sato Tsutomu (40) | 佐藤 勉 | 01.12.25–01.03.26 |
| ? | | ? |
| LtCdr Fujii Akiyoshi (49) | 藤井明義 | 01.09.33–01.12.33 |
| LtCdr Kobayashi Hajime (48) | 小林 一 | 01.12.33–05.07.34 |
| LtCdr Harada Kaku (41) | 原田 覚 | 05.07.34–16.07.34 |
| LtCdr Kawasaki Mutsuro (51) | 川崎陸郎 | 15.12.38– |
| ? | | ? |
| LtCdr Tabata Naoshi (58) | 田畑 直 | 11.41–10.02.42 |
| ? | | ? |
| Lt Kawaguchi Genbei (66) | 川口源兵衛 | 17.03.43–02.09.45 |
| RO-59 呂59 ロ59 | | |
| Type (Class): L3 (RO-57) | | |
| Call Sign: JUGP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1920 Program: | | 1918 |
| Laid Down: | | 21.05.1921 |
| Launched: | | 28.06.1922 |
| Completed: | | 20.02.1923 |
| Service: | | |
| SubDiv 6, 1st SubRon, 1st Fleet | | 20.03.23–01.08.26 |
| SubDiv 6, 2nd SubRon, 2nd Fleet | | 01.08.26–01.12.26 |
| SubDiv 6, Yokosuka ND | | 01.12.26–01.12.27 |
| SubDiv 6, Yokosuka Defence Div., Yokosuka ND | 01.12.27–30.11.29 |
| SubDiv 6, Yokosuka ND | | 30.11.29–01.12.30 |
| SubDiv 6, Yokosuka Defence Div., Yokosuka ND | 01.12.30–11.12.33 |
| SubDiv 6, Yokosuka Guard Sqdn, Yokosuka ND | 01.12.33–22.04.34 |
| SubDiv 6, Yokosuka Defence Div., Yokosuka ND | 22.04.34–15.06.34 |
| SubDiv 6, Yokosuka Guard Sqdn, Yokosuka ND | 15.06.34–15.11.34 |
| SubDiv 6, Yokosuka ND | | 15.11.34–01.11.38 |
| SubDiv 6, 2nd Reserve, Yokosuka ND | | 01.11.38–15.12.38 |
| 3rd Reserve, Yokosuka ND | | 15.12.38–01.06.39 |
| Yokosuka ND | | 01.06.39–01.08.39 |
| SubDiv 6, Gunnery School, Yokosuka ND | | 01.07.39–15.11.39 |
| 1st Reserve, Ominato Guard Division | | 15.11.39–01.11.41 |
| SubDiv 6, Kure ND | | 01.11.41–15.01.43 |
| SubDiv 6, Yokosuka ND | | 15.01.43–01.05.45 |
| 4th Reserve, Kure ND, 6th Fleet (Hulked) | | 01.05.45–15.08.45 |
Fate: On 01.05.45 became a stationery training hulk at Kure. 02.09.45 surrendered. Scrapped 1946. |
| Removed from Navy List | | 01.05.1945 |
| Commanding Officers: | | |
| Lt Koda Takero (41) | 古宇田武郎 | 01.12.22–14.05.23 |
| Lt Daigo Tadashige (40) | 醍醐忠重 | 15.05.23–10.05.24 |
| Lt Yatsushiro Sukeyoshi (40) | 八代祐吉 | 10.05.24–20.10.24 |
| Lt Ishizaki Noboru (42) | 石崎 昇 CK | 20.10.24–01.12.26 |
| LtCdr Komazawa Katsumi (42) | 駒沢克己 | 01.12.26–10.12.28 |
| ? | | 10.12.28– |
| LtCdr Sato Torajiro (43) | 佐藤寅治郎 | 05.06.30–30.06.30 |
| LtCdr Imazato Hiroshi (45) | 今里 博 | 30.06.30–06.07.31 |
| ? | | 06.07.32– |
| LtCdr Ota Nobunosuke (47) | 太田信之輔 | 01.12.31–23.08.32 |
| ? | | 23.08.32– |
| LtCdr Fujii Akiyoshi (49) | 藤井明義 | 15.11.33–01.12.33 |
| ? | | 01.12.33– |
| Cdr Harada Kaku (41) | 原田 覚 | 15.08.34–22.10.34 |
| ? | | 22.10.34– |
| LtCdr Kinashi Takakazu (51) | 木梨鷹一 | 15.12.38–20.03.40 |
| ? | | 20.03.44– |
| Cdr Iwagami Hidetoshi (46) | 岩上英寿 | 04.03.41–27.04.41 |
| ? | | 27.04.41– |
| LtCdr Tanabe Yahachi (56) | 田辺弥八 | 15.10.41–31.01.42 |
| ? | | 31.01.42– |
| Lt Nakayama Denshichi (61) | | 05.06.42–26.08.42 |
| Capt Narahara Shogo (48) | 楢原省吾 | 26.08.42–15.10.42 |
| Lt Okabe Takeshi (63) | 岡部 猛 | 15.10.42– |
| ? | ? | –01.05.45 |
| RO-60 呂60 ロ60 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JUIP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 05.12.1921 |
| Launched: | | 22.12.1922 |
| Completed: | | 17.09.1923 |
| Service: | | |
| Sasebo ND | | 17.09.23–09.02.24 |
| SubDiv 26, Sasebo Defence Div, Sasebo ND | 09.02.24–01.04.24 |
| SubDiv 26, 2nd SubRon, 2nd Fleet | | 01.04.24–01.12.25 |
| SubDiv 26, 1st SubRon, 1st Fleet | | 01.12.25–15.12.26 |
| SubDiv 26, Sasebo Defence Div, Sasebo ND | 15.12.26–10.12.28 |
| SubDiv 26, 1st SubRon, 1st Fleet | | 10.12.28–01.12.30 |
| SubDiv 26, Sasebo Defence Div, Sasebo ND | 01.12.30–15.11.33 |
| SubDiv 26, Sasebo ND | | 15.11.33–15.11.34 |
| SubDiv 26, Sasebo Guard Sqdn, Sasebo ND | 15.11.34–15.11.35 |
| SubDiv 26, Sasebo ND | | 15.11.35–15.12.38 |
| SubDiv 26, 3rd Reserve, Sasebo ND | | 15.12.38–15.11.39 |
| SubDiv 26, 4rd Reserve, Sasebo ND, | | 15.11.39–15.11.40 |
| SubDiv 26, 7th SubRon, 4th Fleet | | 15.11.40–15.01.42 |
Fate: Grounded at 02:00 on Kwajalein (09°00'N, 167°30'E). 0 dead; 66 saved. |
| Removed from Navy List | | 15.01.1942 |
| Commanding Officers: | | |
| LtCdr Yokoyama Sugao (36) | 横山管雄 | 17.09.23–15.10.23 |
| LtCdr Hiraoka Kumeichi (39) | 平岡粂一 | 15.10.23–20.10.24 |
| LtCdr Yatsushiro Sukeyoshi (40) | 八代祐吉 | 20.10.24–21.07.25 |
| LtCdr Miwa Shigeyoshi (39) | 三輪茂義 | 21.07.25–01.12.25 |
| LtCdr Ohashi Tatsuo (40) | 大橋竜男 | 01.12.25–25.08.26 |
| LtCdr Kanemasu Yoshio (40) | 金枡義夫 | 25.08.26–10.02.28 |
| Reserve | | 10.02.28–20.09.28 |
| LtCdr Tsuruoka Nobumichi (43) | 鶴岡信道 No? | 20.09.28–05.09.29 |
| LtCdr Takezaki Kaoru (45) | 竹崎 馨 | 05.09.29–01.12.31 |
| LtCdr Uemura Niwazo (47) | 植村庭三 | 01.12.31–01.09.33 |
| LtCdr Ono Ryojiro (48) | 小野良二郎 | 01.09.33–01.06.34 |
| Reserve | | 01.06.34–15.10.40 |
LtCdr Nakamura Otsuji (52)
= also written Uno Otsuji | 中村乙二 | 15.10.40–15.07.41 |
| LtCdr Fujimori Yasuo (56) | 藤森康男 | 15.07.41–29.12.41 |
| RO-61 呂61 ロ61 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JUIP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 05.06.1922 |
| Launched: | | 19.05.1923 |
| Completed: | | 09.02.1924 |
| Service: | | |
| SubDiv 26, Sasebo Defence Div, Sasebo ND | 09.02.24–01.04.24 |
| SubDiv 26, 2nd SubRon, 2nd Fleet | | 01.04.24–01.12.25 |
| SubDiv 26, 1st SubRon, 1st Fleet | | 01.12.25–15.12.26 |
| SubDiv 26, Sasebo Defence Div, Sasebo ND | 15.12.26–10.12.28 |
| SubDiv 26, 1st SubRon, 1st Fleet | | 10.12.28–01.12.30 |
| SubDiv 26, Sasebo Defence Div , Sasebo ND | 01.12.30–15.11.33 |
| SubDiv 26, Sasebo ND | | 15.11.33–15.11.34 |
| SubDiv 26, Sasebo Guard Sqdn, Sasebo ND | 15.11.34–15.11.35 |
| SubDiv 26, Sasebo ND | | 15.11.35–15.12.38 |
| SubDiv 26, 3rd Reserve, Sasebo ND | | 15.12.38–15.11.39 |
| SubDiv 26, 4rd Reserve, Sasebo ND | | 15.11.39–15.11.40 |
| SubDiv 26, 7th SubRon, 4th Fleet | | 15.11.40–14.07.42 |
| SubDiv 26, 5th Fleet | | 14.07.42–20.10.42 |
Fate: Sunk 31.08.42 by USS Reid (DD-369) in Aleutian Islands (52°36'N, 173°57W). 60 dead; 5 saved. |
| Removed from Navy List | | 20.10.1942 |
| Commanding Officers: | | |
| LtCdr Ishibashi Toshinari (36) | 石橋敏成 | 09.02.24–01.12.24 |
| LtCdr Takatsuka Seigo (38) | 高塚省吾 | 01.12.24–01.12.26 |
| LtCdr Oka Takazumi (39) | 岡 敬純 | 01.12.26–20.05.27 |
| LtCdr Yatsushiro Sukeyoshi (40) | 八代祐吉 | 20.05.27–10.12.28 |
| LtCdr Nishino Kozo (48) | 西野耕三 | 10.12.28–01.11.29 |
| Reserve | | 01.11.29–01.12.30 |
| LtCdr Fukuda Isamu (44) | 福田 勇 | 01.12.30–04.11.31 |
| Reserve | | 04.11.31–16.07.34 |
| LtCdr Minamizato Katsuji (48) | 南里勝次 | 16.07.34–15.12.34 |
| Reserve | | 15.12.34–01.12.37 |
| LtCdr Matsumura Kanji (50) | 松村寛治 | 01.12.37–15.11.38 |
| ? | | 15.08.38– |
| LtCdr Ueno Toshitake (56) | 上野利武 | 15.11.39–15.04.40 |
| LtCdr Nakamura Shozo (54) | 中村省三 | 15.04.40–15.10.40 |
| LtCdr Ohashi Katsuo (53) | 大橋勝夫 | 15.10.40–31.07.41 |
| LtCdr Yamamoto Hideo (56) | 山本秀男 | 31.07.41–24.05.42 |
| *Lt Tokutomi Toshisada (59) | 徳富利貞 | 24.05.42–31.08.42 |
| RO-62 呂62 ロ62 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JUJP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 08.09.1922 |
| Launched: | | 19.09.1923 |
| Completed: | | 24.07.1924 |
| Service: | | |
| SubDiv 33, Sasebo Defence Div, Maizuru ND | 24.07.24–01.09.24 |
| SubDiv 26, 2nd SubRon, 2nd Fleet | | 01.09.24–01.12.25 |
| SubDiv 26, 1st SubRon, 1st Fleet | | 01.12.25–15.12.26 |
| SubDiv 26, Sasebo Defence Div , Sasebo ND | 15.12.26–10.12.28 |
| SubDiv 26, 1st SubRon, 1st Fleet | | 10.12.28–01.12.30 |
| SubDiv 26, Sasebo Defence Div, Sasebo ND | 01.12.30–15.11.33 |
| SubDiv 26, Sasebo ND | | 15.11.33–15.11.34 |
| SubDiv 26, Sasebo Guard Sqdn, Sasebo ND | | 15.11.34–15.11.35 |
| SubDiv 26, Sasebo ND | | 15.11.35–15.12.38 |
| SubDiv 26, 3rd Reserve, Sasebo ND | | 15.12.38–15.11.39 |
| SubDiv 26, 4rd Reserve, Sasebo ND | | 15.11.39–15.11.40 |
| SubDiv 26, 7th SubRon, 4th Fleet | | 15.11.40–14.07.42 |
| SubDiv 26, 5th Fleet | | 14.07.42–15.11.42 |
| SubDiv 26, Kure NDF | | 15.11.42–01.12.43 |
| SubDiv 33, Kure SubRon, Kure ND | | 01.12.43–10.10.44 |
| Kure ND | | 10.10.44–12.04.45 |
| SubDiv 33, Kure SubRon, Kure ND | | 12.04.45–15.09.45 |
Fate: 02.09.45 surrendered at Maizuru. Scuttled 05.46 in Iyo Wan. |
| Removed from Navy List | | 20.11.1945 |
| Commanding Officers: | | |
| ? | | 24.07.24–01.12.25 |
| LtCdr Fukuzawa Tsunekichi (41) | 福沢常吉 | 01.12.25–01.12.27 |
| LtCdr Matsuzaki Akira (43) | 松崎 彰 | 01.12.27–10.12.28 |
| LtCdr Sasaki Hankyu (45) | 佐々木半九 | 01.12.29–01.12.30 |
| LtCdr Tamaki Tomejiro (45) | 玉木留次郎 | 01.12.30–14.11.31 |
| Reserve | | 14.11.31–24.09.32 |
| LtCdr Okamoto Yoshisuke (47) | 岡本義助 | 24.09.32–01.11.34 |
| LtCdr Okata Tadashi (50) | 大畑 正 | 01.11.34–15.11.34 |
| Reserve | | 15.11.34–15.12.38 |
| LtCdr Tanaka Makio (52) | 田中万喜夫 | 15.12.38–30.10.40 |
| LtCdr Ota Takeshi (55) | 大田 武 | 30.10.40–31.07.41 |
| LtCdr Takizawa Koreaki (57) | 滝沢是介 | 31.07.41–24.05.42 |
| LtCdr Shimada Takeo (59) | 島田武夫 | 24.05.42–15.10.42 |
| LtCdr Sato Sakuma (60) | 佐藤作馬 | 15.10.42–10.12.42 |
| Cdr Yoshitome Zenji (52) | 吉留 善 | 10.12.42–19.12.42 |
| LtCdr Nagai Katsuhiko (57) | 長井勝彦 | 19.12.42–16.03.43 |
| LtCdr Nomura Shunji (60) | 野村俊治 | 16.03.43–25.05.43 |
| Lt Tsukudo Tatsuo (63) | 筑土竜男 | 25.05.43–20.08.43 |
| Lt Enomoto Yasuo (63) | 榎本泰夫 | 20.08.43–20.12.43 |
| Lt Tsukudo Tatsuo (63) | 筑土竜男 | 20.12.43–09.03.44 |
| Cdr Yoshimura Iwao (51) | 吉村 巌 | 09.03.44–30.04.44 |
| Lt Kamihiroshi Yasuo (66) | 上拾石 康雄 | 30.04.44–25.08.44 |
| Lt Nakagawa Hiroshi (68) | 中川 博 | 25.08.44–14.10.44 |
| Lt Kurita Yoshifumi (69) | 栗田義文 | 14.10.44–15.12.44 |
| Lt Ono Shinpei (68) | 小野信平 | 15.12.44–09.01.45 |
| Lt Sato Kiyoteru (66) | 佐藤清輝 | 09.01.45–01.06.45 |
| Lt Imanishi Saburo (67) | 今西三郎 | 01.06.45–12.06.45 |
| Lt Hayakawa Norimasa (64) | 早川尋匡 | 12.06.45–02.09.45 |
|
| RO-63 呂63 ロ63 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JUKP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 23.04.1923 |
| Launched: | | 24.01.1924 |
| Completed: | | 20.12.1924 |
| Service: | | |
| SubDiv 33, Maizuru ND | | 20.12.24–01.06.25 |
| SubDiv 24, Sasebo ND | | 01.06.25–01.12.25 |
| SubDiv 24, 1st SubRon,1st Fleet | | 01.12.25–10.12.28 |
| SubDiv 24, Sasebo Defence Div, Sasebo ND | 10.12.28–30.11.29 |
| SubDiv 24, 1st SubRon,1st Fleet | | 30.11.29–01.12.30 |
| SubDiv 24, Sasebo ND | | 01.12.30–01.12.31 |
| SubDiv 24, Sasebo Defence Div, Sasebo ND | 01.12.31–11.12.33 |
| SubDiv 24, Sasebo Guard Sqdn, Sasebo ND | 11.12.33–15.11.34 |
| SubDiv 24, Sasebo ND | | 15.11.34–01.12.36 |
| SubDiv 24, Sasebo Defence Sqdn, Sasebo ND | 01.12.36–01.01.38 |
| SubDiv 24, Sasebo ND | | 01.01.38–15.11.39 |
| SubDiv 33, Kure Submarine School, Kure ND | 15.11.39–15.11.40 |
| SubDiv 33, 7th SubRon, 4th Fleet | | 15.11.40–14.07.42 |
| SubDiv 33, 5th Fleet | | 14.07.42–25.09.42 |
| SubDiv 33, Kure ND | | 25.09.42–01.12.43 |
| SubDiv 33, Kure SubRon, Kure ND | | 01.12.43–15.09.45 |
Fate: 02.09.45 surrendered at Maizuru, scuttled 05.46 in Iyo Wan. |
| Removed from Navy List | | 20.11.1945 |
| Commanding Officers: | | |
| LtCdr Hiraoka Kumeichi (39) | 平岡粂一 | 20.12.24–01.12.25 |
| LtCdr Kousokabe Yuzuru (38) | 香宗我部 譲 | 01.12.25–15.01.28 |
| LtCdr Ito Jotaro (42) | 伊藤尉太郎 | 15.01.28–10.03.29 |
| Reserve | | 10.03.29–29.06.29 |
| Lt Nakaoka Nobuki (45) | 中岡信喜 | 29.06.29–30.11.29 |
| LtCdr Otake Toshio (45) | 大竹寿雄 | 30.11.29–01.12.31 |
| LtCdr Shimizu Taro (48) | 清水太郎 | 01.12.31–20.03.34 |
| LtCdr Yamada Takashi (49) | 山田 隆 | 20.03.34–15.02.36 |
| Lt Yamada Kaoru (50) | 山田 薫 | 15.02.36–20.03.37 |
| LtCdr Inaba Michimune (51) | 稲葉通宗 | 20.03.37–31.07.37 |
| LtCdr Hasegawa Minoru (51) | 長谷川 稔 | 31.07.37–15.11.37 |
| LtCdr Hanabusa Hiroshi (51) | 花房博志 | 15.11.37–19.03.38 |
| LtCdr Inaba Michimune (51) | 稲葉通宗 | 19.03.38–15.12.38 |
| LtCdr Yajima Yasuo (51) | 矢島安雄 | 15.12.38–01.09.39 |
| LtCdr Tagami Akiji (51) | 田上明次 | 01.09.39–20.11.39 |
| LtCdr Ohira Masajiro (52) | 大平政二郎 | 20.11.39–20.03.40 |
| Lt Izutsu Monshiro (57) | 井筒紋四郎 | 20.03.40–15.10.40 |
| LtCdr Kusaka Toshio (53) | 日下敏夫 | 15.10.40–09.02.42 |
| LtCdr Nagai Katsuhiko (57) | 長井勝彦 | 09.02.42–14.10.42 |
| LtCdr Nambu Nobuyuki (61) | 南部伸清 | 14.10.42–15.03.43 |
| LtCdr Kondo Fumitake (62) | 近藤文武 | 15.03.43–24.07.43 |
| LtCdr Nishiuchi Shoichi (60) | 西内正一 | 25.07.43–19.12.43 |
| LtCdr Suzuki Katsuhito (63) | 鈴木勝人 | 19.12.43–22.02.44 |
| Cdr Otani Kiyonori (49) | 大谷清教 | 22.02.44–29.04.44 |
| Lt Takema Chuzo (65) | 竹間忠三 | 29.04.44–04.08.44 |
| Lt Koreeda Sadayoshi (64) | 是枝貞義 | 04.08.44–19.08.44 |
| Lt Arai Kanichi (69) | 新井貫一 | 19.08.44–05.11.44 |
| Lt Imanishi Saburo (67) | 今西三郎 | 05.11.44–19.07.45 |
| Lt Morita Ryoji (64) | 森田良二 | 19.07.45–29.07.45 |
| Lt Taketomi Kunio (65) | 武富邦夫 | 29.07.45–02.09.45 |
| RO-64 呂64 ロ64 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JULP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 15.10.1923 |
| Launched: | | 19.08.1924 |
| Completed: | | 30.04.1925 |
| Service: | | |
| SubDiv 33, Maizuru ND | | 30.04.25–01.06.25 |
| SubDiv 24, Sasebo ND | | 01.06.25–01.12.25 |
| SubDiv 24, 1st SubRon, 1st Fleet | | 01.12.25–10.12.28 |
| SubDiv 24, Sasebo Defence Div, Sasebo ND | 10.12.28–30.11.29 |
| SubDiv 24, 1st SubRon, 1st Fleet | | 30.11.29–01.12.30 |
| SubDiv 24, Sasebo ND | | 01.12.30–01.12.31 |
| SubDiv 24, Sasebo Defence Div, Sasebo ND | 01.12.31–11.12.33 |
| SubDiv 24, Sasebo Guard Sqdn, Sasebo ND | 11.12.33–15.11.34 |
| SubDiv 24, Sasebo ND | | 15.11.34–01.12.36 |
| 4th Reserve, Sasebo ND | | 01.12.36–01.03.39 |
| 2nd Reserve, Sasebo ND | | 01.03.39–01.05.39 |
| Chinkai Defence Div, Chinkai Guard District | | 01.05.39–01.07.39 |
| SubDiv 24, Sasebo ND | | 01.07.39–15.11.39 |
| SubDiv 33, Kure Submarine School, Kure ND | | 15.11.39–15.11.40 |
| SubDiv 33, 7th SubRon, 4th Fleet | | 15.11.40–14.07.42 |
| SubDiv 33, 5th Fleet | | 14.07.42–25.09.42 |
| SubDiv 33, Kure NDF | | 25.09.42–01.12.43 |
| SubDiv 33, Kure SubRon, Kure NDF | | 01.12.43–10.08.45 |
Fate: Sunk 12.04.45 at 14:38 by mine in Hiroshima Bay. 81 dead; 0 saved. |
| Removed from Navy List | | 10.08.1945 |
| Commanding Officers: | | |
| LtCdr Daigo Tadashige (40) | 醍醐忠重 | 15.01.25–01.12.25 |
| Lt Koda Takero (41) | 古宇田武郎 | 01.12.25–01.12.26 |
| LtCdr Nakahara Yoshimasa (49) | 中原義正 | 01.12.26–01.12.27 |
| LtCdr Matsuzaki Akira (43) | 松崎 彰 | 01.12.27–10.12.28 |
| Reserve | | 10.12.28–01.11.29 |
| LtCdr Tamaki Tomejiro (45) | 玉木留次郎 | 01.11.29–01.12.30 |
| LtCdr Sasaki Hankyu (45) | 佐々木半九 | 01.12.30–01.12.31 |
| Lt Nagai Hiroaki (48) | 永井宏明 | 01.12.31–01.12.32 |
| LtCdr Shimizu Taro (48) | 清水太郎 | 01.12.32–25.03.33 |
| Lt Hatanaka Sumihiko (49) | 畑中純彦 | 25.03.33–15.02.36 |
| LtCdr Izu Junichi (51) | 伊豆寿市 | 15.02.36–30.03.37 |
| LtCdr Hanabusa Hiroshi (51) | 花房博志 | 30.03.37–15.11.37 |
| LtCdr Ikezawa Masayuki (52) | 池沢政幸 | 15.11.37–19.03.38 |
| LtCdr Yoshitome Zenji (52) | 吉留 善 | 19.03.38–01.04.39 |
| LtCdr Ogawa Tsunayoshi (50) | 小川綱吉 | 01.04.39–20.03.40 |
| Reserve | | 20.03.40–26.07.40 |
| LtCdr Uno Kameo (53) | 宇野亀雄 | 26.07.40–09.02.42 |
| LtCdr Tabata Naoshi (58) | 田畑 直 | 09.02.42–14.10.42 |
| Lt Wada Mutsuo (61) | 和田睦雄 | 14.10.42–24.03.43 |
| Capt Kato Ryonosuke (48) | 加藤良之助 | 24.03.43–31.08.43 |
| Capt Narahara Shogo (48) | 楢原省吾 | 31.08.43–19.01.44 |
| LtCdr Okayama Noboro (64) | 岡山 登 | 19.01.44–29.04.44 |
| Lt Ono Yasushi (65) | 大野保四 | 29.04.44–30.08.44 |
| Lt Sato Kiyoteru (66) | 佐藤清輝 | 30.08.44–13.10.44 |
| Lt Kiuchi Tetsuro (69) | 木内哲朗 | 13.10.44–05.11.44 |
| Lt Tokunaga Masahiko (67) | 徳永正彦 | 05.11.44–08.12.44 |
| Lt Yoshizawa Chiaki (69) | 吉沢千明 | 08.12.44–14.02.45 |
| Capt Otani Kiyonori (49) | 大谷清教 | 14.02.45–14.03.45 |
| *LtCdr Ankyu Eitaro (50) | 安久栄太郎 | 14.03.45–12.04.45 |
| RO-65 呂65 ロ65 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JUMP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 15.11.1924 |
| Launched: | | 25.09.1925 |
| Completed: | | ? |
| Service: | | |
| SubDiv 33, Maizuru ND | | 30.06.26–15.12.26 |
| SubDiv 27, Sasebo Defence Div, Sasebo ND | 15.12.26–15.01.27 |
| SubDiv 27, 1st SubRon, 1st Fleet | | 15.01.27–30.11.29 |
| SubDiv 27, Sasebo Defence Div, Sasebo ND | 30.11.29–24.12.29 |
| SubDiv 27, 2nd SubRon, 2nd Fleet | | 24.12.29–01.12.30 |
| SubDiv 27, Sasebo Defence Div , Sasebo ND | 01.12.30–01.10.32 |
| SubDiv 27, Sasebo Guard Ron, Sasebo ND | 01.10.32–15.11.33 |
| SubDiv 27, Sasebo Defence Div , Sasebo ND | 15.11.33–01.12.33 |
| SubDiv 27, Sasebo Guard Ron, Sasebo ND | 01.12.33–15.11.35 |
| SubDiv 27, Sasebo Defence Ron, Sasebo ND | 15.11.35–15.12.38 |
| SubDiv 27, 2nd Reserve, Sasebo ND | | 15.12.38–15.11.39 |
| SubDiv 27, 1st Reserve, Sasebo ND | | 15.11.39–15.11.40 |
| SubDiv 27, 7th SubRon, 4th Fleet | | 15.11.40–10.02.42 |
| SubDiv 26, 7th SubRon, 4th Fleet | | 10.02.42–14.07.42 |
| SubDiv 26, 5th Fleet | | 14.07.42–15.11.42 |
| SubDiv 26, Kure ND | | 15.11.42–20.11.42 |
Fate: Sunk 04.11.42 by US aircraft at Kiska (51°58'N, 177°33'E). 19 dead; 45 saved. |
| Removed from Navy List | | 20.11.1942 |
| Commanding Officers: | | |
| LtCdr Saito Eisho (42) | 斎藤栄章 | 01.03.26–15.05.28 |
| LtCdr Uozumi Jisaku (42) | 魚住治策 | 16.05.28–20.09.29 |
| Lt Otake Toshio (45) | 大竹寿雄 | 20.09.29–30.11.29 |
| Lt Nagai Takeo (47) | 長井武夫 | 30.11.29–01.04.31 |
| Reserve | | 01.04.31–01.12.31 |
| LtCdr Sugiura Norio (47) | 杉浦矩郎 | 01.12.31–20.08.32 |
| LtCdr Hamano Motoichi (47) | 浜野元一 | 20.08.32–15.11.33 |
| Reserve | | 15.11.33–01.11.34 |
| LtCdr Emi Tetsushiro (50) | 江見哲四郎 | 01.11.34–28.02.35 |
| LtCdr Matsumura Kanji (50) | 松村寛治 | 28.02.35–20.03.37 |
| LtCdr Togami Ichiro (51) | 戸上一郎 | 20.03.37–01.12.37 |
| Reserve | | 01.12.37–01.11.39 |
| LtCdr Ota Takeshi (55) | 大田 武 | 01.11.39–20.03.40 |
| LtCdr Ueno Toshitake (56) | 上野利武 | 20.03.40–28.09.40 |
| LtCdr Harada Hakue (52) | 原田毫衛 | 28.09.40–31.07.41 |
| LtCdr Kudo Kaneo (56) | 工藤兼男 | 31.07.41–15.02.42 |
| LtCdr Torisu Kennosuke (58) | 鳥巣建之助 | 15.02.42–30.05.42 |
| LtCdr Yamaguchi Kazuo (61) | 山ロー生 | 30.05.42–30.06.42 |
| Lt Egi Syochi (60) | 江木尚一 | 30.06.42–04.11.42 |
| RO-66 呂66 ロ66 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JUNP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 01.12.1925 |
| Launched: | | 25.10.1926 |
| Completed: | | 28.07.1927 |
| Service: | | |
| SubDiv 27, 1st SubRon, 1st Fleet | | 28.07.27–30.11.29 |
| SubDiv 27, Sasebo Defence Div, Sasebo ND | 30.11.29–24.12.29 |
| SubDiv 27, 2nd SubRon, 2nd Fleet | | 24.12.29–01.12.30 |
| SubDiv 27, Sasebo Defence Div, Sasebo ND | | 01.12.30–01.10.32 |
| SubDiv 27, Sasebo Guard Sqdn, Sasebo ND | | 01.10.32–15.11.33 |
| SubDiv 27, Sasebo Defence Div, Sasebo ND | | 15.11.33–01.12.33 |
| SubDiv 27, Sasebo Guard Sqdn, Sasebo ND | | 01.12.33–15.11.35 |
| SubDiv 27, Sasebo Defence Sqdn, Sasebo ND | 15.11.35–15.12.38 |
| SubDiv 27, 2nd Reserve, Sasebo ND | | 15.12.38–15.11.39 |
| SubDiv 27, 1st Reserve, Sasebo ND | | 15.11.39–15.11.40 |
| SubDiv 27, 7th SubRon,4th Fleet | | 15.11.40–15.01.42 |
Fate: Sunk 17.12.41 at 20:20 in collision with RO-62 25 miles SW of Wake Island. 63 dead; 3 saved. |
| Removed from Navy List | | 15.01.1942 |
| Commanding Officers: | | |
| LtCdr Hirano Rokuzo (41) | 平野六三 | 28.07.27–10.12.28 |
| LtCdr Okushima Tsunesaburo (44) | 奥島章三郎 | 10.12.28–15.11.30 |
| ? | | ? |
| LtCdr Shimazui Takemi (47) | 島居威美 | 01.05.31–02.11.31 |
| LtCdr Mizobatane Sadaichi (46) | 溝畠定一 | 02.11.31–15.11.33 |
| Reserve | | 15.11.33–15.11.34 |
| LtCdr Kayabara Yasuchika (49) | 栢原保親 | 15.11.34–27.02.35 |
| ? | | ? |
| Lt Shibata Genichi (51) | 柴田源一 | 15.02.36–20.03.37 |
| LtCdr Kawasaki Mutsuro (51) | 川崎陸郎 | 20.03.37–31.07.37 |
| LtCdr Matsumura Kanji (50) | 松村寛治 | 31.07.37–30.11.37 |
| LtCdr Inoue Tadakane (51) | 井上規矩 | 01.12.37–19.03.38 |
| LtCdr Nakamura Shozo (54) | 中村省三 | 19.03.38–30.07.38 |
| LtCdr Inada Hiroshi (51) | 稲田 洋 | 30.07.38–20.03.39 |
| LtCdr Taoka Kiyoshi (55) | 田岡 清 | 20.03.39–27.07.39 |
| LtCdr Kohiga Masaru (53) | 小比賀 勝 | 27.07.39–26.07.40 |
| *LtCdr Kurokawa Hideyuki (54) | 黒川英幸 | 26.07.40–17.12.41 |
| RO-67 呂67 ロ67 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JUOP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 05.03.1925 |
| Launched: | | 18.03.1926 |
| Completed: | | 15.12.1926 |
| Service: | | |
| SubDiv 27 | | 15.12.26–15.01.27 |
| SubDiv 27, 1st SubRon, 1st Fleet | | 15.01.27–30.11.29 |
| SubDiv 27, Sasebo Defence Div, Sasebo ND | | 30.11.29–24.12.29 |
| SubDiv 27, 2nd SubRon, 2nd Fleet | | 24.12.29–01.12.30 |
| SubDiv 27, Sasebo Defence Div, Sasebo ND | | 01.12.30–01.10.32 |
| SubDiv 27, Sasebo Guard Ron, Sasebo ND | | 01.10.32–15.11.33 |
| SubDiv 27, Sasebo Defence Div, Sasebo ND | | 15.11.33–01.12.33 |
| SubDiv 27, Sasebo Guard Ron, Sasebo ND | | 01.12.33–15.11.35 |
| SubDiv 27, Sasebo Defence Ron, Sasebo ND | | 15.11.35–15.12.38 |
| SubDiv 27, 2nd Reserve, Sasebo ND | | 15.12.38–15.11.39 |
| SubDiv 27, 1st Reserve, Sasebo ND | | 15.11.39–15.11.40 |
| SubDiv 27, 7th SubRon, 4th Fleet | | 15.11.40–10.02.42 |
| SubDiv 26, 7th SubRon, 4th Fleet | | 10.02.42–14.07.42 |
| SubDiv 26, 5th Fleet | | 14.07.42–15.11.42 |
| SubDiv 26, Kure ND (training boat) | | 15.11.42–01.12.43 |
| SubDiv 33, Kure SubRon, Kure ND (training boat) | | 01.12.43–20.07.45 |
| Reserve Boat, Sasebo ND (training hulk) | | 20.07.45–02.09.45 |
Fate: On 20.07.45 became a stationery training hulk at Kure. 02.09.45 surrendered. Scrapped 1946. |
| Removed from Navy List | | 20.07.1945 |
| Commanding Officers: | | |
| LtCdr Yamazaki Shigeaki (41) | 山崎重暉 | 15.12.26–15.11.27 |
| LtCdr Mito Hisashi (42) | 三戸 寿 | 01.12.27–15.12.28 |
| Lt Hayashi Kiyosuke (43) | 林 清亮 | 15.12.28–05.11.29 |
| Lt Miyazaki Takeji (46) | 宮崎武治 | 15.11.29–31.03.30 |
| Lt Endo Keiyu (46) | 遠藤敬勇 | 01.04.30–01.04.31 |
| Lt Tsuzuki Noboru (48) | 都築 登 | 01.04.31–01.12.31 |
| LtCdr Okada Yusaku (47) | 岡田有作 | 01.12.31–15.03.33 |
| LtCdr Endo Keiyu (46) | 遠藤敬勇 | 15.03.33–16.07.34 |
| LtCdr Shimizu Taro (48) | 清水太郎 | 16.07.34–21.10.34 |
| LtCdr Okata Tadashi (50) | 大畑 正 | 15.11.34–15.02.36 |
| Lt Hirokawa Takashi (51) | 広川 隆 | 15.02.36–05.05.36 |
| LtCdr Hamano Motoichi (47) | 浜野元一 | 05.05.36–01.12.36 |
| Reserve | | 01.12.36–01.09.39 |
| LtCdr Narusawa Sennao (52) | 成沢千直 | 01.09.39–15.11.39 |
| LtCdr Ohashi Katsuo (53) | 大橋勝夫 | 15.11.39–20.03.40 |
| LtCdr Watanabe Katsuji (55) | 渡辺勝次 | 20.03.40–30.10.40 |
| LtCdr Yoshitome Zenji (52) | 吉留 善 | 30.10.40–31.10.41 |
| LtCdr Imamoto Masayuki (58) | 井元正之 | 31.10.41–09.05.42 |
| LtCdr Torisu Kennosuke (58) | 鳥巣建之助 | 09.05.42–29.05.42 |
| LtCdr Yamaguchi Kazuo (61) | 山ロー生 | 29.05.42–25.08.42 |
| LtCdr Nakayama Denshichi (61) | 中山伝七 | 25.08.42–15.03.4 |
| Lt Ebato Kazuo (62) | 江波戸和郎 | 15.03.43–30.11.43 |
| LtCdr Yamaguchi Kazuo (61) | 山ロー生 | 30.11.43–19.12.43 |
| LtCdr Fumon Shozo (63) | 普門正三 | 19.12.43–31.03.44 |
| LtCdr Oba Saichi (62) | 大場佐一 | 31.03.44–09.07.44 |
| Capt Otani Kiyonori (49) | 大谷清教 | 09.07.44–30.08.44 |
| LtCdr Taniura Hideo (65) | 谷浦英男 | 30.08.44–13.10.44 |
| Lt Okakita Akimasa (69) | 岡北明正 | 13.10.44–06.11.44 |
| Lt Tokioka Takami (67) | 時岡隆美 | 06.11.44–10.12.44 |
| Lt Takahashi Shingo (68) | 高橋真吾 | 10.12.44–03.05.45 |
| Lt Samejima Osamu (67) | 鮫島 修 | 03.05.45–31.05.45 |
| Lt Morita Ryoji (64) | 森田良二 | 31.05.45–19.07.45 |
| Reserve | | 19.07.45–02.09.45 |
| RO-68 呂68 ロ68 | | |
| Type (Class): L4 (RO-60) | | |
| Call Sign: JUPP | | |
| Builder: Mitsubishi Heavy Industries, Kobe | | |
| Ordered under the 1922 Program: | | 1919 |
| Laid Down: | | 06.02.1924 |
| Launched: | | 23.02.1925 |
| Completed: | | 29.10.1925 |
| Service: | | |
| SubDiv 33, Maizuru ND | | 29.10.25–01.12.25 |
| SubDiv 24, 1st SubRon, 1st Fleet | | 01.12.25–10.12.28 |
| SubDiv 24, Sasebo Defence Div, Sasebo ND | 10.12.28–30.11.29 |
| SubDiv 24, 1st SubRon, 1st Fleet | | 30.11.29–25.06.30 |
| Sasebo ND | | 25.06.30–01.12.30 |
| SubDiv 24, Sasebo ND | | 01.12.30–01.12.31 |
| SubDiv 24, Sasebo Defence Div, Sasebo ND | 01.12.31–11.12.33 |
| SubDiv 24, Sasebo Guard Ron, Sasebo ND | | 11.12.33–15.11.34 |
| SubDiv 24, Sasebo ND | | 15.11.34–01.12.36 |
| SubDiv 24, Sasebo Defence Ron, Sasebo ND | | 01.12.36–01.01.38 |
| SubDiv 24, Sasebo ND | | 01.01.38–15.11.39 |
| SubDiv 33, Kure Submarine School, Kure ND | | 15.11.39–15.11.40 |
| SubDiv 33, 7th SubRon, 4th Fleet | | 15.11.40–14.07.42 |
| SubDiv 33, 5th Fleet | | 14.07.42–25.09.42 |
| SubDiv 33, Kure ND | | 25.09.42–01.12.43 |
| SubDiv 33, Kure SubRon, Kure ND | | 01.12.43–15.08.44 |
| Kure ND | | 15.08.44–15.05.45 |
| 51st Squadron, Maizuru ND | | 15.05.45–15.08.45 |
Fate: 02.09.45 surrendered. Scuttled 30.04.46 in Maizuru Bay. |
| Removed from Navy List | | 30.11.1945 |
| Commanding Officers: | | |
| LtCdr Nakamura Motoji (39) | 中邑元司 | 29.10.25–30.11.26 |
| LtCdr Takagi Takeo (39) | 高木武雄 | 01.12.26–01.12.27 |
| LtCdr Nabeshima Shunsaku (42) | 鍋島俊策 | 01.12.27–10.12.28 |
| Reserve | | 10.12.28–01.11.29 |
| Lt Hayashi Kazuo (45) | 林 一雄 | 01.11.29–01.12.31 |
| Lt Fujimoto Den (48) | 藤本 伝 | 01.12.31–01.09.33 |
| Cdr Ohashi Tatsuo (40) | 大橋竜男 | 01.09.33–01.12.33 |
| LtCdr Fujimoto Den (48) | 藤本 伝 | 01.12.33–01.06.34 |
| LtCdr Koizumi Kiichi (49) | 小泉麒一 | 01.06.34–15.11.35 |
| LtCdr Shichiji Tsuneo (49) | 七字恒雄 | 15.11.35–20.06.36 |
| LtCdr Emi Tetsushiro (50) | 江見哲四郎 | 20.06.36–01.12.36 |
| LtCdr Irie Tatsushi (51) | 入江 達 | 01.12.36–20.03.37 |
| LtCdr Tagami Akiji (51) | 田上明次 | 20.03.37–01.07.37 |
| Reserve | | 01.07.37–01.12.37 |
| LtCdr Togami Ichiro (51) | 戸上一郎 | 01.12.37–30.07.38 |
| LtCdr Hirokawa Takashi (51) | 広川 隆 | 30.07.38–25.11.39 |
| LtCdr Harada Hakue (52) | 原田毫衛 | 25.11.39–20.03.40 |
| LtCdr Taoka Kiyoshi (55) | 田岡 清 | 20.03.40–15.10.40 |
| LtCdr Tanaka Makio (52) | 田中万喜夫 | 15.10.40–31.07.41 |
| LtCdr Izutsu Monshiro (57) | 井筒紋四郎 | 31.07.41–22.05.42 |
| LtCdr Manabe Masateru (60) | 真鍋正輝 | 22.05.42–04.11.42 |
| Capt Kato Ryonosuke (48) | 加藤良之助 | 04.11.42–15.03.43 |
| LtCdr Tategami Rikuta (60) | 館上陸太 | 15.03.43–31.07.43 |
| LtCdr Suzuki Shokichi (62) | 鈴木正吉 | 31.07.43–19.01.44 |
| Lt Sugamasa Tetsuaki (65) | 菅昌徹昭 | 19.01.44–19.03.44 |
| Lt Uesugi Kazuaki (63) | 上杉一秋 | 19.03.44–06.44 |
| Lt Imai Kenji (67) | 今井賢二 | 06.44–01.07.44 |
| LtCdr Uesugi Kazuaki (63) | 上杉一秋 | 01.07.44–13.10.44 |
| LtCdr Yamanaka Yoshiaki (66) | 山中修明 | 13.10.44–31.05.45 |
| Lt Samejima Osamu (67) | 鮫島 修 | 31.05.45–02.09.45 |
| RO-100 呂100 ロ100 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kure Navy Yard | | |
| Ordered under the 4th Replacement Program (#210): | 1941 |
| Laid Down: | | 30.06.1941 |
| Launched: | | 06.12.1941 |
| Completed: | | 23.09.1942 |
| Service: | | |
| Kure SubRon, Kure ND | | 01.09.42–15.12.42 |
| 7th SubRon, 8th Fleet, SE Area Fleet | | 05.12.42–15.04.43 |
| 7th SubRon, SE Area Fleet | | 15.04.43–20.08.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 20.08.43–05.02.1944 |
Fate: Sunk 25.11.43 at 19:10 by mine 2 miles NE of Buin (06°50'S, 155°58'E). 38 dead; 12 saved. |
| Removed from Navy List | | 05.02.1944 |
| Commanding Officers: | | |
| Lt Sakamoto Kaneyoshi (61) | 坂本金美 | 30.05.42–30.08.43 |
| Lt Seki Tanisan (63) | 関 教孝 | 30.08.43–10.09.43 |
| *LtCdr Ogane Hisao (63) | 大金久男 | 30.08.43–25.11.43 |
| RO-101 呂101 ロ101 | | |
| Type (Class): KS (RO-100) | | |
| Ordered under the 4th Replacement Program (#211): | 1941 |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Laid Down: | | 30.09.1941 |
| Launched: | | 17.04.1942 |
| Completed: | | 31.10.1942 |
| Service: | | |
| Kure SubRon, Kure ND | | 31.10.42–16.01.43 |
| 7th SubRon, 8th Fleet, SE Area Fleet | | 16.01.43–15.04.43 |
| 7th SubRon, SE Area Fleet | | 15.04.43–20.08.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 20.08.43–12.09.43 |
Fate: Sunk 15.09.43 at 14:46 by USS Saufly (DD-465) off Guadalcanal (10°57'S, 163°56'E). 50 dead; 0 saved. |
| Removed from Navy List | | 01.12.1943 |
| Commanding Officers: | | |
| LtCdr Orita Zenji (59) | 折田善次 | 20.07.42–28.08.43 |
| *Lt Arima Fumio (64) | 有馬文夫 | 20.08.43–28.08.43 |
| (KIA 28.08.43 enrout to take command) | | |
| Lt Seki Tanisan (63) | 関 教孝 | 28.08.43–03.09.43 |
| *Lt Fujisawa Masatake (63) | 藤沢政方 | 03.09.43–12.09.43 |
| RO-102 呂102 ロ102 | | |
| Type (Class): KS (RO-100) | | |
| Ordered under the 4th Replacement Program (#212): | 1941 |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Laid Down: | | 30.09.1941 |
| Launched: | | 17.04.1942 |
| Completed: | | 17.11.1942 |
| Service: | | |
| Kure SubRon, Kure ND | | 17.11.42–16.01.43 |
| 7th SubRon, 8th Fleet, SE Area Fleet | | 16.01.43–15.04.43 |
| 7th SubRon, SE Area Fleet | | 15.04.43–15.07.43 |
Fate: Sunk 14.05.43 by USS PT-150 in Vitiaz Strait, New Guinea (06°55'N, 147°34'E). 42 dead; 0 saved. |
| Removed from Navy List | | 15.07.1943 |
| Commanding Officers: | | |
| *LtCdr Kanemoto Shoji (61) | 兼本正二 | 29.07.42–14.05.43 |
| RO-103 呂103 ロ103 |
| Type (Class): KS (RO-100) | | |
| Builder: Kure Navy Yard | | |
| Ordered under the 4th Replacement Program (#213): | 1941 |
| Laid Down: | | 30.06.1941 |
| Launched: | | 06.12.1941 |
| Completed: | | 21.10.1942 |
| Service: | | |
| Kure SubRon, Kure ND | | 21.10.42–05.01.43 |
| 7th SubRon, 8th Fleet, SE Area Fleet | | 05.01.43–15.04.43 |
| 7th SubRon, SE Area Fleet | | 15.04.43–20.08.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 20.08.43–01.11.43 |
Fate: Missing from 10.08.43. 50 dead; 0 saved. |
| Removed from Navy List | | 01.11.1943 |
| Commanding Officers: | | |
| Lt Sakamoto Kaneyoshi (61) | 坂本金美 | 25.07.42–29.08.42 |
| LtCdr Fujita Hidenori (62) | 藤田秀範 | 29.08.42–14.02.43 |
| *Lt Ichimura Rikinosuke (64) | 市村力之助 | 15.02.43–10.08.43 |
| RO-104 呂104 ロ104 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#214): | 1941 |
| Laid Down: | | 19.11.1941 |
| Launched: | | 11.07.1942 |
| Completed: | | 25.02.1943 |
| Service: | | |
| Kure SubRon, Kure ND | | 25.02.43–01.04.43 |
| 11th SubRon, 1st Fleet | | 01.04.43–05.06.43 |
| 7th SubRon, SE Area Fleet | | 05.06.43–20.08.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 20.08.43–01.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 01.03.44–10.08.44 |
Fate: Sunk 23.05.44 at 08:34 by USS England (DE-635) 250 miles NNW Kavieng (01°26N, 149°20'E). 58 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| LtCdr Hamazumi Yoshihisa (61) | 浜住芳久 | 25.02.43–15.03.43 |
| LtCdr Shoda Keiji (62) | 正田啓治 | 15.03.43–09.01.44 |
| *Lt Izubuchi Shikari (64) | 出淵 愈 | 09.01.44–23.05.44 |
| RO-105 呂105 ロ105 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#215): | 1941 |
| Laid Down: | | 19.11.1941 |
| Launched: | | 11.07.1942 |
| Completed: | | 05.03.1943 |
| Service: | | |
| Kure SubRon, Kure ND | | 05.03.43–01.04.43 |
| 11th SubRon, 1st Fleet | | 01.04.43–05.06.43 |
| 7th SubRon, SE Area Fleet | | 05.06.43–20.08.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 20.08.43–01.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 01.03.44–31.05.44 |
Fate: Sunk 31.05.44 at 07:35 by USS England (DE-635) 200 miles NNW of Kavieng (01°47'N, 149°56'E). 55 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| LtCdr Nishiuchi Shoichi (60) | 西内正一 | 05.03.43–15.03.43 |
| LtCdr Oba Saichi (62) | 大場佐一 | 15.03.43–09.01.44 |
| *LtCdr Inoue Junichi (64) | 井上順一 | 09.01.44–31.05.44 |
| RO-106 呂106 ロ106 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kure Navy Yard | | |
| Ordered under the 4th Replacement Program (#216): | 1941 |
| Laid Down: | | 17.12.1941 |
| Launched: | | 30.05.1942 |
| Completed: | | 26.12.1942 |
| Service: | | |
| Kure SubRon, Kure ND | | 26.12.42–15.03.43 |
| 11th SubRon, 1st Fleet | | 15.03.43–15.04.43 |
| 7th SubRon, SE Area Fleet | | 15.04.43–20.08.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 20.08.43–01.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 01.03.44–10.08.44 |
Fate: Sunk 22.05.44 at 03:52 by USS England (DE-635) 250 miles N of Kavieng (01°40N, 150°31'E). 49 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| LtCdr Saeki Takeo (59) | 佐伯 卓夫 | 26.12.42–11.06.43 |
| LtCdr Nakamura Motoo (62) | 中村元夫 | 12.06.43–14.05.44 |
| *Lt Uda Keitai (66) | 宇田恵泰 | 15.05.44–22.05.44 |
| RO-107 呂107 ロ107 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kure Navy Yard | | |
| Ordered under the 4th Replacement Program (#217): | 1941 |
| Laid Down: | | 17.12.1941 |
| Launched: | | 30.05.1942 |
| Completed: | | 26.12.1942 |
| Service: | | |
| Kure SubRon, Kure ND | | 16.12.42–15.03.43 |
| 11th SubRon, 1st Fleet | | 15.03.43–15.04.43 |
| 7th SubRon, SE Area Fleet | | 15.04.43–20.08.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 20.08.43–01.09.43 |
Fate: Sunk 12.07.43 at 05:10 by USS Radford (DD-446) 15 miles E of Kolombangara (08°00'S, 157°19'E). 42 dead; 0 saved. |
| Removed from Navy List | | 01.09.1943 |
| Commanding Officers: | | |
| *Lt Egi Syochi (60) | 江木尚一 | 04.11.42–12.07.43 |
| RO-108 呂108 ロ108 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#218): | 1941 |
| Laid Down: | | 20.04.1942 |
| Launched: | | 26.10.1942 |
| Completed: | | 20.04.1923 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 20.04.43–01.08.43 |
| 7th SubRon, SE Area Fleet | | 01.08.43–01.09.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 01.09.43–01.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 01.03.44–10.08.44 |
Fate: Sunk 26.05.44 at 23:23 by USS England (DE-635) 110 miles N of Manus (00°32'S, 148°35'E). 53 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| LtCdr Arai Atsushi (63) | 荒井 淳 | 20.04.43–20.01.44 |
| *Lt Obari Kanichi (65) | 小針寛一 | 20.01.44–26.05.44 |
| RO-109 呂109 ロ109 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#400): | 1941 |
| Laid Down: | | 20.04.1942 |
| Launched: | | 26.10.1942 |
| Completed: | | 30.04.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 30.04.43–15.08.43 |
| 7th SubRon, SE Area Fleet | | 15.08.43–01.09.43 |
| SubDiv 51, 7th SubRon, SE Area Fleet | | 01.09.43–01.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 01.03.44–15.08.44 |
| Kure SubRon, Kure ND | | 15.08.44–25.09.44 |
| SubDiv 33, Kure SubRon, Kure ND | | 25.09.44–20.10.44 |
| SubDiv 34, 6th Fleet | | 20.10.44–10.06.45 |
Fate: Sunk 25.04.45 by USS Horace A Bass (APD-124) 165 miles SSW of Daito Jima (21°58'N, 129°38'E). 65 dead; 0 saved. |
| Removed from Navy List | | 10.06.1945 |
| Commanding Officers: | | |
| LtCdr Uesugi Kazuaki (63) | 上杉一秋 | 30.04.43–20.03.44 |
| LtCdr Sugamasa Tetsuaki (65) | 菅昌徹昭 | 20.03.44–05.08.44 |
| LtCdr Oba Saichi (62) | 大場佐一 | 05.08.44–05.09.44 |
| LtCdr Toji Jun (66) | 湯地 惇 | 05.09.44–14.10.44 |
| LtCdr Masuzawa Seiji (65) | 増沢清司 | 14.10.44–17.03.45 |
| *Lt Nakagawa Hiroshi (68) | 中川 博 | 17.03.45–25.04.45 |
| RO-110 呂110 ロ110 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#401): | 1941 |
| Laid Down: | | 20.08.1942 |
| Launched: | | 26.01.1943 |
| Completed: | | 10.07.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 06.07.43–10.11.43 |
| SubDiv 30, 8th SubRon, SW Area Fleet | | 10.11.43–20.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 20.03.44–30.04.44 |
Fate: Sunk 02.02.44 by HMIS Jumna 200 miles NE Madras, India (17°25'N 83°21'E). 47 dead; 0 saved. |
| Removed from Navy List | | 30.04.1944 |
| Commanding Officers: | | |
| *Lt Ebato Kazuo (62) | 江波戸和郎 | 06.07.43–11.02.44 |
| RO-111 呂111 ロ111 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawaski Shipyard, Kobe | | |
| Ordered under the 4th Replacement Program (#402): | 1941 |
| Laid Down: | | 20.08.1942 |
| Launched: | | 26.01.1943 |
| Completed: | | 19.07.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 19.07.43–31.10.43 |
| SubDiv 30, SW Area Fleet | | 31.10.43–01.01.44 |
| SubDiv 30, 8th SubRon, 6th Fleet | | 01.01.44–20.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 20.03.44–10.08.44 |
Fate: Sunk 10.06.44 at 15:58 by USS Taylor (DD-468) N of Admiralty Islands (00°26'N, 149°16'E). 54 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| *LtCdr Nakamura Naozo (62) | 中村直三 | 19.07.43–10.06.44 |
| RO-112 呂112 ロ112 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawaski Shipyard, Kobe | | |
| Ordered under the 4th Replacement Program (#403): | 1941 |
| Laid Down: | | 20.06.1942 |
| Launched: | | 25.03.1943 |
| Completed: | | 14.09.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 14.09.43–25.11.43 |
| 11th SubRon, 6th Fleet | | 25.11.43–25.12.43 |
| SubDiv 30, SW Area Fleet | | 25.12.43–01.01.44 |
| SubDiv 30, 8th SubRon, 6th Fleet | | 01.01.44–20.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 20.03.44–15.08.44 |
| Kure SubRon, Kure ND | | 15.08.44–25.09.44 |
| SubDiv 33, Kure SubRon, Kure ND | | 25.09.44–20.10.44 |
| SubDiv 34, 6th Fleet | | 20.10.44–10.05.45 |
Fate: Sunk 11.02.45 at 22:02 by USS Batfish (SS-310) off Camiguin Island, Philippines (18°53'N, 121°50'E). 61 dead; 0 saved. |
| Removed from Navy List | | 10.05.1945 |
| Commanding Officers: | | |
| LtCdr Kondo Fumitake (62) | 近藤文武 | 25.07.43–05.08.44 |
| Lt Matsujima Shigeo (66) | 松島茂雄 | 05.08.44–31.08.44 |
| Lt Sakamoto Doni (67) | 坂本道二 | 31.08.44–14.10.44 |
| LtCdr Uesugi Kazuaki (63) | 上杉一秋 | 14.10.44–05.01.45 |
| *LtCdr Toji Jun (66) | 湯地 惇 | 05.01.44–11.02.45 |
| RO-113 呂113 ロ113 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#404): | 1941 |
| Laid Down: | | 11.07.1942 |
| Launched: | | 24.04.1943 |
| Completed: | | 12.10.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 01.10.43–25.11.43 |
| 11th SubRon, 6th Fleet | | 25.11.43–31.01.44 |
| SubDiv 30, 8th SubRon, 6th Fleet | | 31.01.44–25.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 25.03.44–15.08.44 |
| 8th SubRon, 6th Fleet | | 15.08.44–20.02.45 |
| SubDiv 34, 6th Fleet | | 20.02.44–10.05.45 |
Fate: Sunk 13.02.45 at 04:49 by USS Batfish (SS-310) off Babuyan Island, Philippines (19°10'N, 121°23'E). 59 dead; 0 saved. |
| Removed from Navy List | | 10.05.1945 |
| Commanding Officers: | | |
| ? | | ?–20.10.43 |
| Lt Watanabe Hisashi (64) | 渡辺 久 | 20.10.43–01.08.44 |
| *Lt Harada Kiyoshi (66) | 原田 潔 | 01.08.44–13.02.45 |
| RO-114 呂114 ロ114 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#405): | 1941 |
| Laid Down: | | 12.10.1942 |
| Launched: | | 19.06.1943 |
| Completed: | | 20.11.1943 |
| Service: | | |
| 11th SubRon, 1st Fleet | | 20.11.43–25.11.43 |
| 11th SubRon, 6th Fleet | | 25.11.43–20.02.44 |
| SubDiv 30, 8th SubRon, 6th Fleet | | 20.02.44–25.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 25.03.44–10.08.44 |
Fate: Sunk 17.06.44 by USS Wadleigh (DD-689) 80 miles W of Tinian (15°02'N, 144°10'E). 55 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| LtCdr Kawashima Mamoru (64) | 河島 守 | 20.11.43–30.04.44 |
| *Lt Ata Yoshiro (65) | 阿多義広 | 30.04.44–17.06.44 |
| RO-115 呂115 ロ115 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#406): | 1941 |
| Laid Down: | | 12.10.1942 |
| Launched: | | 19.06.1943 |
| Completed: | | 30.11.1943 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 30.11.43–10.03.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 10.03.44–15.08.44 |
| 8th SubRon, 6th Fleet | | 15.08.44–20.02.45 |
| DessDiv 34, 6th Fleet | | 20.02.45–10.05.45 |
Fate: Sunk 31.01.45 at 00:15 by USS Ulvert M Moore (DE-442) 125 miles SW of Manila (13°20'N, 119°20'E). 59 dead; 0 saved. |
| Removed from Navy List | | 10.05.1945 |
| Commanding Officers: | | |
| Lt Koreeda Sadayoshi (64) | 是枝貞義 | 30.11.43–04.08.44 |
| *Lt Takema Chuzo (65) | 竹間忠三 | 05.08.44–31.01.45 |
| RO-116 呂116 ロ116 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#407): | 1941 |
| Laid Down: | | 16.01.1943 |
| Launched: | | 13.09.1943 |
| Completed: | | 21.01.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 21.01.44–04.05.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 04.05.44–10.08.44 |
Fate: Sunk 24.05.44 by USS England (DE-635) N of Admiralty Islands (00°53'N, 149°14'E). 56 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| *LtCdr Okabe Takeshi (63) | 岡部 猛 | 21.01.44–24.05.44 |
| RO-117 呂117 ロ117 | | |
| Type (Class): KS (RO-100) | | |
| Builder: Kawasaki Shipbuilding Co, Kobe | | |
| Ordered under the 4th Replacement Program (#408): | 1941 |
| Laid Down: | | 16.01.1943 |
| Launched: | | 13.09.1943 |
| Completed: | | 31.01.1944 |
| Service: | | |
| 11th SubRon, 6th Fleet | | 31.01.44–14.05.44 |
| SubDiv 51, 7th SubRon, 6th Fleet | | 14.05.44–10.08.44 |
Fate: Sunk 24.06.44 by US aircraft 350 miles SE of Saipan (11°50'N, 150°31'E). 55 dead; 0 saved. |
| Removed from Navy List | | 10.08.1944 |
| Commanding Officers: | | |
| *LtCdr Enomoto Yasuo (63) | 榎本泰夫 | 20.12.43–24.06.44 |
| RO-500 呂500 ロ500 | | |
| Class: IX–C | | |
| Builder: DeutscheWerft AG, Hamburg | | |
| Ordered: | | 20.10.1939 |
| Laid Down: | | 21.02.1941 |
| Launched: | | 22.09.1941 |
| Completed as Kriegsmarine U-511: | | 08.12.1941 |
| Service: | | |
| German Navy | | 08.12.41–01.09.43 |
| Sold to Japan and commissioned as RO-500: | | 16.09.1943 |
| Kure ND | | 16.09.43–03.12.43 |
| 6th Fleet | | 03.12.43–20.05.44 |
| SubDiv 33, Kure SubRon, Kure ND | | 20.05.44–01.07.44 |
| Kure ND | | 01.07.44–01.11.44 |
| Otake Submarine School | | 01.11.44–05.05.45 |
| 51st Squadron, Maizuru ND | | 05.05.45–30.11.45 |
Fate: 02.09.45 surrendered. Scuttled 30.04.46 in Wakasa Gulf. |
| Removed from Navy List | | 30.11.1945 |
| Commanding Officers: | | |
| German Lt Friedrich Steinhoff | | 08.12.41–17.12.42 |
| German Lt Fritz Schneewind | | 18.12.42–15.09.43 |
| LtCdr Taoka Kiyoshi (55) | 田岡 清 | 16.09.43–03.12.43 |
| Lt Uesugi Sadao (65) | 上杉貞夫 | 03.12.43–31.01.44 |
| Lt Yamazaki Toshio (67) | 山崎俊夫 | 31.01.44–30.04.44 |
| Lt Shiizuka Mitsuo (66) | 椎塚三夫 | 30.04.44–05.07.44 |
| Lt Yamamoto Hiroo [?] (66) | 山本寛雄 | 05.07.44–15.09.44 |
| Lt Yamamoto Yasuhisa (67) | 山本康久 | 15.09.44–30.11.45 |
| RO-501 呂501 ロ501 | | |
| Class: Type IX–C.40 | | |
| Builder: Deutsche Werft AG, Hamburg |
| Ordered: | | 1941 |
| Laid Down: | | 30.11.1942 |
| Launched: | | 07.07.1943 |
| Completed as Kriegsmarine U-1224: | | 20.10.1943 |
| Service: | | |
| German Navy | | 20.10.43–15.02.44 |
| Sold to Japan: | | 15.02.1944 |
| Commissioned as RO-501: | | 28.02.1944 |
| 8th SubRon, Combined Fleet | | 15.02.44–10.10.44 |
Fate: Sunk 13.05.44 by USS Francis M Robinson (DE-220) 500 miles W of Cape Verde Islands (18°08'N, 33°13W). 52 dead; 0 saved. |
| Removed from Navy List | | 10.10.1944 |
| Commanding Officers: | | |
| German Lt Georg Preuss | | 20.10.43–15.02.44 |
| *LtCdr Norita Sadatoshi (57) | 乗田貞敏 | 15.02.44–13.05.44 |
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