The was one of the wartime armaments expansion plans of the Imperial Japanese Navy

Imperial Japanese Navy

The Imperial Japanese Navy was the navy of the Empire of Japan from 1869 until 1947, when it was dissolved following Japan's constitutional renunciation of the use of force as a means of settling international disputes...

 (IJN).

Background

In September 1942, after being defeated in the Battle of Midway, the IJN drew up a new armaments expansion plan. This plan was combined by the 5th Naval Armaments Supplement Programme and the 6th Naval Armaments Supplement Programme to build the aircraft carriers rapidly. The main article was to build 20 aircraft carriers, and removed all battleships and heavy cruisers. They had approved 412 vessels, 1,150,000 tons. However, most of plans were not achieved. Until the end of the war only 60 vessels from this plan were completed.

Table of vessels

Category	Class	Vessel number(s)	Completed	Converted	Cancelled
Aircraft carrier	Unryū Unryū class aircraft carrier The were World War II Japanese aircraft carriers. 16 carriers were planned under the Maru Kyū Programme and the Kai-Maru 5 Programme . However, only 3 carriers were completed.-Design:...	#5001–5015	Amagi Japanese aircraft carrier Amagi was a of the Imperial Japanese Navy built during World War II. Named after Mount Amagi, and completed late in the war; she never embarked her complement of aircraft and did not participate in any battles. The ship capsized in July 1945 after being hit multiple times during airstrikes by American... (#5001), Katsuragi Japanese aircraft carrier Katsuragi was a of the Imperial Japanese Navy built during World War II. Named after Mount Katsuragi, and completed late in the war; she never embarked her complement of aircraft and did not participate in any battles. The ship was badly damaged in a July 1945 airstrike by American carrier aircraft on Kure... (#5003)	#5002 and #5005 were converted to the Shinano Japanese aircraft carrier Shinano named after the ancient Shinano Province, was an aircraft carrier of the Imperial Japanese Navy during World War II. Initially laid down as the third of the battleships, Shinano′s partially complete hull was converted to an aircraft carrier in 1942, midway through construction. Over the next two...	#5008–5015
	G15 (Mod. Taiho)	#5021–5025			#5021–5025
Seaplane tender	Akitsushima Japanese seaplane tender Akitsushima The was a seaplane tender of the Imperial Japanese Navy, serving during the World War II from 1942 until being sunk in September 1944.-Design:In 1938, the IJN wanted to use their large-sized flying boats more effectively, because the Kawanishi H6K was the only aircraft able to hit the Pearl Harbor...	#5031–5033			#5031–5033
Submarine tender	J27	#5034–5036			#5034–5036
Light cruiser	C44	#5037–5038			#5037–5038
Minelayer	H12C Hatsutaka class minelayer The was a class of minelayers of the Imperial Japanese Navy , serving during the World War II. They have three sub classes, this article handles them collectively.-Design:...	#5039			#5039
Destroyer Type-A	Yūgumo	#5041–5048			#5041–5048
Destroyer Type-B	Akizuki Akizuki class destroyer (1942) The was one of the primary classes of new destroyers of the Imperial Japanese Navy after 1942. The IJN called them from their plan name. They were designed to fight larger ships, aircraft and submarines....	#5061–5083			#5061–5083
Cruiser submarine Type-A	I-13	#5091–5093	I-14 Japanese submarine I-14 The submarine I-14 was a large, seaplane-carrying submarine of the Imperial Japanese Navy of the AM type. 400 feet long and 40 feet high, it didn't see action in World War II. With a range of 21,000 nmi, it could carry two or three Aichi M6A Seiran bombers, whose wings and tail could be folded to... (#5091)
	S48	#5094–5096			#5094–5096
Cruiser submarine Type-B	I-54	#5101–5114			#5101–5114
	S49A	#5115–5132			#5115–5132
Cruiser submarine Type-C	I-52	#5141–5155			#5141–5155
	S49B	#5156–5180			#5156–5180
Medium sized submarine	Ro-35	#5181–5223			#5181–5223
Submarine Special type	I-400 I-400 class submarine The Imperial Japanese Navy submarines were the largest submarines of World War II and remained the largest ever built until the construction of nuclear ballistic missile submarines in the 1960s. They were submarine aircraft carriers able to carry three Aichi M6A Seiran aircraft underwater to their...	#5231–5248	I-400 (#5231), I-401 Japanese submarine I-401 The Sen Toku-class I-401 was once the largest submarine in the world. It was commanded by Lieutenant Commander Nobukiyo Nambu of the Imperial Japanese Navy during World War II... (#5232), I-402 Japanese Submarine I-402 Imperial Japanese Navy submarine I-402, was one of three completed Sen Toku I-400 class submarine aircraft carriers, which proved to be the largest prior to nuclear submarine development. Each were able to carry three Aichi M6A Seiran floatplanes... (#5233)		#5234–5248
Escort ship Type-B	Ukuru Ukuru class escort ship The were a class of ships in the service of the Imperial Japanese Navy during World War II.The Japanese called these ships Kaibōkan, "ocean defence ships" , a name used to denote a multi-purpose vessel....	#5251–5284	Yaku (#5251), Chikubu (#5253), Kōzu (#5255), Hodaka (#5256), Ikara (#5258), Ikuno (#5260)	#5252, 5254, 5257, 5259 and 5263–5266 were converted to the Hiburi class	#5261–#5262, 5267–5284
	Hiburi Hiburi class escort ship The was a sub class of the Mikura class escort ships of the Imperial Japanese Navy , serving during and after World War II. -Background:...		Kume (#5252), Ikuna (#5254), Shisaka (#5257), Sakito (#5259), Mokuto (#5263), Habuto (#5264)		#5265–5266
Minesweeper	No.19 No.19 class minesweeper The was a class of minesweepers of the Imperial Japanese Navy , serving during the World War II. 70 vessels were plannned under the Maru 4 Programme , Maru Kyū Programme and Kai-Maru 5 Programme , however, only 17 vessels were completed.-Background:* Project number I4B. Improved model of the...	#5301–5336			#5301–5336
Subchaser	No.13 No.13 class submarine chaser The was a class of submarine chasers of the Imperial Japanese Navy , serving during and after World War II. There were three sub classes, however the IJN's official document calls all of them the No.13 class.-Background:...	#5341–5370	No.60 (#5341), No.61 (#5342), No.63 (#5344)		#5343, 5345–5370
Fleet oiler	Kazahaya Japanese fleet oiler Kazahaya The was a Japanese fleet oiler, serving during the Second World War.-Construction:*In 1941, the IJN wanted fleet oilers for their carrier task force, because they had only the eight old, low-speed tankers. The IJN prepared sixteen Kawasaki-type tankers to solve this. However, they did not have...	#5381–5387			#5381–5387
	J34	#5388–5395			#5388–5395
Food supply ship	Kinesaki	#5401–5407			#5401–5407
	J20C	#5408			#5408
	J35	#5409–5410			#5409–5410
Target ship	Ōhama Ōhama class target ship The was a bombing target ship class of the Imperial Japanese Navy , serving during World War II. 5 vessels were planned under the Kai-Maru 5 Programme , however, only lead ship Ōhama was completed.-Design and Construction:...	#5411–5415	Ōhama (#5411)		#5412–5415
Repair ship	Akashi Japanese repair ship Akashi Akashi was a Japanese repair ship, serving during the World War II. She was the only specifically designed repair ship operated by the Imperial Japanese Navy. The navy based her design on the US Navy's USS Medusa.-Construction:...	#5416–5417			#5416–5417
Survey ship	J11C Tsukushi class survey ship The was a class of auxiliary ships of the Imperial Japanese Navy , serving during World War II. The class consists of two subclasses, which this article handles collectively.-Background:...	#5418			#5418
Icebreaker	J23	#5419			#5419
Minelayer	Ajiro Sokuten class minelayer (1938) The was a class of minelayers of the Imperial Japanese Navy , serving during and after World War II. The class consists of three subclasses, which this article handles collectively.-Background:...	#5421–5432			#5421–5432
Submarine Type-D	I-361 I-361 class submarine The was a type of the 1st class submarine in the Imperial Japanese Navy serving during the Second World War. The was different from the I-361 class, however since the I-373 was a development form of the I-361 class, this article describes both of them....	#5461–5471	I-361 (#5461), I-362 (#5462), I-363 (#5463), I-364 (#5464), I-365 (#5465), I-366 (#5466), I-367 (#5467), I-368 (#5468), I-369 (#5469), I-370 (#5470), I-371 (#5471)
Destroyer Type-D	Matsu Matsu class destroyer The were a class of destroyer built for the Imperial Japanese Navy , who referred to them as .-Design basis:The Matsu class were built late in World War II, and they were intended to be more cost-effective in response to the changing character of naval warfare at that time...	#5481–5522	Matsu (#5481), Take (#5482), Ume (#5483), Momo (#5484), Kuwa (#5485), Kiri (#5486), Sugi (#5487), Maki (#5488), Momi (#5489), Kashi (#5490), Kaya (#5492), Nara (#5493), Sakura (#5496), Yanagi (#5497), Tsubaki (#5498), Kaki (#5499), Kaba (#5500), Hinoki (#5502), Kaede (#5505), Keyaki (#5508), Tachibana (#5511), Tsuta (#5514), Hagi (#5517), Sumire (#5520), Kusunoki (#5521), Hatsuzakura (#5522)		#5491, 5494–5495, 5501, 5503–5504, 5506–5507, 5509–5510, 5512–5513, 5515–5516, 5518–5519