Background

• Improved model of the No.1-class
  No.1 class minesweeper (1923)
  The was a class of minesweepers of the Imperial Japanese Navy , serving during 1930s and World War II. 6 vessels were built in 1922-29 under the Eight-eight fleet plan. They have two sub classes, this article handles them collectively.-Background:...
  
  . The IJN tried to a small hull than No.1-class to give a performance the same as No.1-class. And it failed by the Tomozuru Incident
  Japanese torpedo boat Tomozuru
  was one of four s of the Imperial Japanese Navy. She capsized in a storm on March 12, 1934, shortly after her completion. This incident forced the IJN to review the stability of all recently completed, under construction and planned ships. She was salvaged and put back into service after extensive...
  
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No.13 class

• Project number I3A. 4 vessels were built in 1931-1934. No.15 and No.16 were behind with the completed by the Tomozuru Incident. They had clipper-bow.

  Ship	Builder	Laid down	Launched	Completed	Fate
  No.13	Fujinagata Shipyards	22 December 1931	30 March 1933	31 August 1933	Sunk by bombardment from Netherlands pillbox at Tarakan Island Tarakan Island Tarakan is an island off the coast of East Kalimantan, Indonesia. It is a marshy island situated in the eastern Celebes Sea, off the northeastern coast of Borneo. The island occupies an area of .-Petroleum:...  on 12 January 1942. Decommissioned on 30 November 1945.
  No.14	Ōsaka Iron Works	22 December 1933	20 March 1933	30 September 1933	Sunk by bombardment from Netherlands pillbox at Tarakan Island on 12 January 1942. Decommissioned on 30 November 1945.
  No.15	Fujinagata Shipyards	6 April 1933	14 February 1934	21 August 1934	Heavily damaged by USS Tilefish USS Tilefish (SS-307) USS Tilefish , a Balao-class submarine, was the only ship of the United States Navy to be named for the tilefish, a large, yellow-spotted deepwater food fish....  on 5 March 1945, later agrounded. Decommissioned on 10 May 1945.
  No.16	Mitsui, Tama Shipyard	20 June 1933	30 March 1934	29 September 1934	Sunk by air raid off Makassar Makassar Makassar, is the provincial capital of South Sulawesi, Indonesia, and the largest city on Sulawesi Island. From 1971 to 1999, the city was named Ujung Pandang, after a precolonial fort in the city, and the two names are often used interchangeably...  06°08′S 119°20′E on 11 September 1943. Decommissioned on 11 November 1943.

No.17 class

• Project number I3B. 2 vessels were built in 1935-1936. Improved model of the No.13-class. About their appearance, bow was changed to double-curvature bow and fitted Kampon geared turbine.

  Ship	Builder	Laid down	Launched	Completed	Fate
  No.17	Ōsaka Iron Works	28 January 1935	3 August 1935	15 January 1936	Decommissioned on 20 November 1945. Scrapped on 1 September 1948.
  No.18	Mitsui, Tama Shipyard	2 February 1935	19 September 1935	30 April 1936	Sunk by air raid off Hainan Hainan Hainan is the smallest province of the People's Republic of China . Although the province comprises some two hundred islands scattered among three archipelagos off the southern coast, of its land mass is Hainan Island , from which the province takes its name... 16°52′N 108°38′E on 26 November 1944. Decommissioned on 10 January 1945.