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
March 2024	Established Tokyo sales-office (TSO)