- 1904 Nippon Toki Partnership founded.
- 1912 Ceramics laboratory built at Nippon Toki; research begins on producing sanitary ceramics.
- 1917 Toyo Toki Co., Ltd. founded in the city of Kokura on Kyushu.
- 1918 Production being of sanitary ceramics.
- 1937 Chigasaki plant constructed.
- 1946 Manufacture begins on faucet hardware.
- 1968 Sale begins of vanity sinks.
- 1969 Trademark is change from Toyotoki to TOTO.
- 1970 Company name change from Toyo Toki to TOTO kiki.