Etorofu class coastal defense ship

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Career
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General characteristics
Displacement:	870 tons standard
Length:	255 ft (77.7 m)
Beam:	29 ft 10 in (9.1 m)
Draft:	10 ft (3.05 m)
Speed:	19.7 knots
Complement:	150
Armament:	3 × 4.7 in (120 mm) / 45 cal DP guns, Initially 4 25 mm AA guns, but later up to 15 × 25 mm AA guns, 36 initially, but up to 60 depth charges and six depth charge throwers one 3.1 in (80 mm) mortar

The Etorofu class coastal defense ships were a class of ships in the service of the Imperial Japanese Navy during World War II.

The fourteen ships of the Etorofu class were a major part of Japan's escorts from the middle of World War II. The Japanese called them "Type A" coast defense ships, and were the second class of Kaibokan. They were called coast defense ships to denote a multi-purpose vessel. The Etorofus, unlike the Shimushu class, received more emphasis on submarine warfare.

The Etorofu class was initially armed with thirty-six depth charges and would later rise to 60 depth charges with a 8 cm trench mortar and six depth charge throwers. The rise of aircraft also saw the number of AA machine guns increase to 15. They would receive Type 22 and Type 13 radars and Type 93 sonar in 1943-1944.

The ships of the class were the Etorofu, Hirado, Tsushima, Fukue, Matsuwa, Mutsure, Sado, Oki, Manju, Kanju, Iki, Amakusa, Wakamiya, and Kasado. Eight of the fourteen ships, Hirado, Iki, Amakusa, Kanju, Wakamiya, Sado, Mutsure, and Matsuwa were sunk during the war.