June 1918 Started medical products wholesale business
October 1947 Registered Kosakai Chemical Industry Co., Ltd.
November 1960 Relocated head office to Nihonbashimuromachi, dealt with food additives and food packing materials
April 1971 Established Osaka office
October 1987 Increased capital amount to 40million yen
April 1991 Established Shizuoka office
September 2015 Moved head office to Nihonbashitomizawacho
June 2018 100th anniversary
May 2023 Established Fukuoka sub-office