The was a class of submarine chasers of the Imperial Japanese Navy (IJN), serving during and after World War II. Nine vessels were built between 1937 and 1939 under the Maru 3 Programme.

Design

Developed under project number was K7, the ''No.4'' class submarine chaser was an improved variant of the ''No.3'' class, with increased freeboard. Other general features were the same as the ''No.3'' class. Their design was elaborate, because the Navy Technical Department (Kampon) devoted itself to making them small. However, the design was not able to accept additional anti-aircraft guns and depth charges.

Ships in class

Footnotes

Bibliography

*''Ships of the World special issue Vol.45, Escort Vessels of the Imperial Japanese Navy'', , (Japan), February 1996 *''The Maru Special, Japanese Naval Vessels No.49, Japanese submarine chasers and patrol boats'', (Japan), March 1981 * {{DEFAULTSORT:4 World War II naval ships of Japan Submarine chasers of the Imperial Japanese Navy Submarine chaser classes