Type B submarine

Class overview
Name	Type-B submarines
Builders	Kure Naval Arsenal Sasebo Naval Arsenal Yokosuka Naval Arsenal Kawasaki Shipbuilding Mitsubishi Heavy Industries
Operators	Imperial Japanese Navy
Preceded by	Junsen type submarine
Subclasses	Type-B (I-15 class) Type-B Modified 1 (I-40 class) Type-B Modified 2 (I-54 class)
Built	1938-1944
In commission	1940-1945

The Cruiser submarine Type-B (巡潜乙型潜水艦, Junsen Otsu-gata sensuikan) was a class of submarine in the Imperial Japanese Navy (IJN) which served during World War II. The Type-B submarines were similar to the Type-A apart from not having the headquarters installation.