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The {{nihongo|'''Additional Naval Armaments Supplement Programme'''|マル追計画, <!---"昭和十六年度戦時艦船建造及ビ航空兵力拡充計画"に続く--->追加計画|Maru Tsui Keikaku, Tsuika Keikaku}} was one of the naval expansion plans of the [[Imperial Japanese Navy]] (IJN).

==Background==
In November 1941, the IJN required many additional submarines for the Pacific War, as a pressing matter. To meet this need, the IJN negotiated with the [[Ministry of Finance (Japan)|Ministry of Finance]] and received approval for 32 submarines and one target ship. Later, they were concluded by 78th, 79th and 81st [[Diet of Japan|Imperial Diet]].

==Table of vessels==
{| class="wikitable" width="80%"
| width="12%" | '''Category'''
| width="8%" | '''Class'''
| width="8%" | '''Vessel number(s)'''
| width="18%" | '''Completed'''
| width="10%" | '''Converted'''
| width="12%" | '''Cancelled'''
|-
| rowspan="2"|Cruiser submarine Type-A
| ''[[Japanese Type-A submarine#Type-A Mod.1 (I-12 class)|I-12]]''
| #620, #621
| ''[[Japanese submarine I-12|I-12]]'' (#620)
| #621 was converted to the ''I-13'' class
| 
|-
| ''[[Japanese Type-A submarine#Type-A Mod.2 (I-13 class)|I-13]]''
| 
| ''[[Japanese submarine I-13|I-13]]'' (#621)
| 
| 
|-
| Cruiser submarine Type-B
| ''[[Japanese Type-B submarine#Type-B Mod.2 (I-54 class)|I-54]]''
| #627, #629, #631, #633 - 636
| ''[[Japanese submarine I-54 (1943)|I-54]]'' (#627), ''{{Jsub|I-56|1944|2}}'' (#629), ''[[Japanese submarine I-58 (1943)|I-58]]'' (#631)
| 
| #633 - 636
|-
| Cruiser submarine Type-C
| ''[[Japanese Type-C submarine#Type-C Mod. (I-52 class)|I-52]]''
| #625, #626, #628, #630, #632
| ''[[Japanese submarine I-52 (1943)|I-52]]'' (#625), ''[[Japanese submarine I-53 (1943)|I-53]]'' (#626), ''[[Japanese submarine I-55 (1944)|I-55]]'' (#628)
| 
| #630, #632
|-
| Medium-sized submarine
| ''[[Kaichū type submarine#Kaichū VII (Sen-Chū, Ro-35 class)|Ro-35]]''
| #640 - 654
| ''[[Japanese submarine Ro-56 (1944)|Ro-56]]'' (#645)
| 
| #640 - 644, #646 - 654
|-
| Tanker submarine
| ''[[Japanese submarine I-351|I-351]]''
| #655 - 657
| ''I-351'' (#655)
| 
| #657
|-
| Target ship
| ''[[Japanese target ship Hakachi|Hakachi]]''
| #660
| ''Hakachi'' (#660)
| 
| 
|-
|}

==See also==
*[[1st Naval Armaments Supplement Programme (Japan, 1931)|1st Naval Armaments Supplement Programme]] (Maru 1 Keikaku, 1931)
*[[2nd Naval Armaments Supplement Programme (Japan, 1934)|2nd Naval Armaments Supplement Programme]] (Maru 2 Keikaku, 1934)
*[[3rd Naval Armaments Supplement Programme (Japan, 1937)|3rd Naval Armaments Supplement Programme]] (Maru 3 Keikaku, 1937)
*[[4th Naval Armaments Supplement Programme (Japan, 1939)|4th Naval Armaments Supplement Programme]] (Maru 4 Keikaku, 1939)
*[[Temporal Naval Armaments Supplement Programme (Japan, 1940)|Temporal Naval Armaments Supplement Programme]] (Maru Rin Keikaku, 1940)
*[[Rapidly Naval Armaments Supplement Programme (Japan, 1941)|Rapidly Naval Armaments Supplement Programme]] (Maru Kyū Keikaku, 1941)
*[[5th Naval Armaments Supplement Programme (Japan, 1941)|5th Naval Armaments Supplement Programme]] (Maru 5 Keikaku, 1941)
*[[6th Naval Armaments Supplement Programme (Japan, 1942)|6th Naval Armaments Supplement Programme]] (Maru 6 Keikaku, 1942)
*[[Modified 5th Naval Armaments Supplement Programme (Japan, 1942)|Modified 5th Naval Armaments Supplement Programme]] (Kai-Maru 5 Keikaku, 1942)
*[[Wartime Naval Armaments Supplement Programme (Japan, 1944)|Wartime Naval Armaments Supplement Programme]] (Maru Sen Keikaku, 1944)

==References==
[[:ja:マル追計画|マル追計画]] (ja)

{{IJN Naval Armnament Supplement Programs}}
{{DEFAULTSORT:Naval Armaments Supplement Programme}}
[[Category:Imperial Japanese Navy]]
[[Category:Military history of Japan]]