We manufacture and sell dry noodles and buckwheat flour, mainly the traditional Shiroishi umen (hot noodles), as well as wheat flour and other products.

Basic information

Head office address 989-0208
1-1-2 Aza-Ohata, Shiroishi-shi, Miyagi prefecture 989-0208
Capital 80,000,000 yen
Founded October 1886 (The former Shiroishi Kosan begins operations)
Established December 2002
Executive director Kazue Wada
Director Etsushi Nakai
Director Koya Kitamura
Auditor Akinori Kawano
Number of employees 38 (as of the end of February 2024)
Business details Manufacturing and sales of dry noodles and buckwheat flour, sales and purchase of wheat flour and processed foods, as well as other related businesses


October 1886 The former Shiroishi Kosan Shokai is founded
1889 The first full-fledged milling factory in Tohoku is established and becomes one of the few throughout Japan to use the "French Stone" Ishiusu-style flour mill
1892 Shiroishi umen is presented to the Imperial Household Ministry and the Crown
September 1894 Shiroishi umen enters the Chicago World’s Fair and receives an award
October 1921 The former SHIROISHI KOSAN, INC. is founded
June 1981 Expands milling factory and begins operations
October 1986 Commemorative ceremony is held to mark the 100th anniversary of the company's founding
November 1989 The former SHIROISHI KOSAN, INC. is commended by the Minister of Education for distinguished service on the occasion of the 100th anniversary of the school lunch program
October 2000 Cup umen (hot noodles with chicken meat and mushrooms) wins the Excellence Award at the 4th Miyagi Monozukuri Grand Prix
May 2005 The current SHIROISHI KOSAN, INC. takes over all operations of the former Shiroishi Kosan and starts its business
February 2010 Becomes a subsidiary of Yoshimura Food Holdings K.K.