The New Nambu M57 (ニューナンブM57) is a series of semi-automatic pistols designed by Shin-Chuō Industries, later merged with Minebea.

So law enforcement officers and military personnel of Japan Self-Defense Forces (JSDF) were equipped with American-made firearms.

[6] Development was completed in 1958, but never entered service because of problems of interoperability between the JSDF and the United States Armed Forces.

Minebea, the successor of Shin-Chuō Industries, developed a modified version of the M57A for the trial and contract.

[8][better source needed] The M57A is a large combat pistol for the JSDF and Maritime Safety Agency (JMSA), which was a 9×19mm Parabellum caliber version of the American M1911A1, in essence.