Nihon Jyozo Kogyo is a company that provides products such as koji starters (aspergillus oryzae), brewed materials, brewing machines and seasonings.

From koji starters koji bean sprouts until the soy sauce, miso



Company Overview

Establishment July3, 1917
Capital 28 million yen
Officers Executive chairmanYukio Ohashi
President & CEOMasayuki Matsuba
main office
Sales Division
(Seasoning・Seed malt)
3-18-9, Koishikawa, Bunkyo-ku, Tokyo Japan
Juo factory
(Koji Starters manufacturing)
2948, Juochoishi, Hitachi-shi, Ibaraki Japan
Delivery center 4-15-28, Suneoricho, Tsurugashima-shi, Saitama Japan
Production trust factory Soy sauce factory  Sakado-shi, Saitama Japan
Miso factory     Ueda-shi, Nagano Japan
NJK building 2-6-1, Sugamo, Toshima-ku, Tokyo Japan

Company History

July, 1917 Established as a company which produces and sells Marufuku koji starters by Togano's soy sause fast brewing method.
December, 1938 Acquired Ibaraki Joban Jyouzou.
1961 Started production of koji starters for sake.
1968 Abandoned the Sugamo Plant (koji starters) and moved to Juocho in Ibaraki Prefecture.
Built NJK building in the site of Sugamo Plant, and leased it to Seiyu Stores and Korakuen.
1974 Built a clean room in Juo Plant and successfully commercialized sterile
koji startersFully relocated Koishikawa Soy Sauce Plant to Kawajiri Plant (Ibaraki Prefecture).
July, 1975 Built a new office building at 3-18-9 Koishikawa, Bunkyo-Ku, Tokyo.
1984 Built a multi-story car park (capacity: 180 cars) at 3-26-3 Koishikawa, Bunkyo-Ku, Tokyo.
August, 2000 Built high-performance automatic control air conditioners, air showers, etc. in Juo Plant.
July, 2001 Built a new office building which serves as an apartment (residential houses) at 3-18-9 Koishikawa, Bunkyo-Ku, Tokyo.
(Marujo Sunlight Koishikawa 21)
October, 2002 Introduced a suction device in Juo Plant which can collect spores only.
March, 2004 Introduced high-performance dehumidification equipment in Juo Plant.
March, 2010 Ventured into the restaurant business. Opened first Kasugano restaurant.
May, 2013 Built a warehouse in Juo Plant.
November, 2017 Obtained halal certification at the Juo Plant.
March, 2021 Obtained HACCP at Juo Plant. (certified by Ibaraki Food Sanitation Association)
November, 2021 Completed the renovation work of the head office building and condominium. (Renewed as NJK Marquis Koishikawa)

Other Business

◆Real estate

We provide leasing business of real estates including apartments and car parks. Koishikawa's head office building and condominium underwent renovation work in 2021, and is being used by many guests as a rental condominium.

Real estate


Main Office

Juo Factory

Marufuku Koji Starters Product introduction


About the Koji Starters, this The inquiry by the email is this