- May. 1942
- Kansai Steamship’s predecessor, Kansai Kisen Kaisha, founded as a domestic passenger ship operator under Osaka Shosen Kaisha.
- Jan. 1951
- A liner-service route opened between Japan and Bangkok.
Exands liner and tramper services to and from Okinawa, South Korea, Southeast Asia and Australia.
- Jun. 1956 ～ Jun. 1958
- Builds oceangoing freighters to strengthen its overseas business.
- Feb. 1975
- Spins off from Kansai Kisen Kaisha and sets up a new company, Kanki Gaiko（Kansai Steamship）.
Takes over the following routes from Kansai Kisen Kaisha, primarily carrying general merchandise and textile products: liner-service routes to and from Bangkok and Taiwan, a tramper-service route to and from Southeast Asia and deep-sea tramper-service routes to and from Australia and others.
- Sep. 1982
- Constructs pure car carriers as part of its business-enlargement efforts and charters them out on long-term contracts to Mitsui O.S.K. Lines (begins the ship-chartering business).
- Enhances its steel stock transport to Bangkok to keep up with the growing number of Japanese enterprises making inroads into Thailand. Establishes a position as a steel stock carrier.
- Builds the MV Nanyo and MV Toyo, both optimum for moving steel stock, which later leads to the Siam series.
- Jan. 2002
- Changes its corporate name from Kanki Gaiko to Kansai Line（Kansai Steamship）.