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| 1936/12/25 | Established with capital of ¥2 million to construct a baseball stadium for the exclusive use of a professional team. |
|---|---|
| 1937/9 | Completed the baseball stadium. |
| 1942/9 | Established a consolidated subsidiary, Korakuen Real Estate Co., Ltd. |
| 1949/5 | Listed on the Tokyo Stock Exchange. |
| 1949/7 | Listed on the Osaka Securities Exchange. |
| 1949/10 | Completed a bicycle racetrack. |
| 1955/7 | Started operating an urban-style mechanized amusement park. |
| 1959/12 | Started operating the Ishiuchi Korakuen Ski Resort. |
| 1962/1–4 | Started operating a bowling assembly hall with saunas, halls, restaurants, and etc. (presently the Blue Building). |
| 1962/2 | Established a consolidated subsidiary, Korakuen Food Service Co., Ltd. |
| 1965/8 | Started operating the Atami Korakuen Hotel. |
| 1971/9 | Established a consolidated subsidiary, Korakuen Locomotive Co., Ltd. |
| 1972/5 | Established a consolidated subsidiary, Hokkaido Korakuen Co., Ltd. |
| 1973/3 | Discontinued the municipal bike race. |
| 1973/4 | Started operating the Yellow Building with an off-track betting place, a roller skating arena, bowling alleys, and others. |
| 1973/9 | Started operating the Sapporo Korakuen Country Club. |
| 1977/11 | Started operating an annex to the Yellow Building with an off-track betting place. |
| 1980/2 | Established a consolidated subsidiary, Korakuen Finance Co., Ltd. |
| 1984/7 | Established a consolidated subsidiary, Atami Korakuen Co., Ltd. |
| 1985/10 | Established a consolidated subsidiary, Osaka Korakuen Hotel Co., Ltd. |
| 1986/10 | Started operating Osaka Korakuen Hotel. |
| 1987/2 | Established a consolidated subsidiary, Sapporo Korakuen Hotel Co., Ltd. |
| 1987/3 | Purchased a consolidated subsidiary, Nishinihon Korakuen Co., Ltd. |
| 1988/3 | Started operating Tokyo Dome. |
| 1988/6 | Started operating Sapporo Korakuen Hotel. |
| 1989/5 | Started operating the Batoh Korakuen Golf Course and Hotel. |
| 1990/9 | Changed our company name from Korakuen Co., Ltd. to TOKYO DOME CORPORATION. |
| 1990/12 | Started operating BIG EGG Plaza I and Prism Hall. |
| 1992/7 | Started operating BIG EGG Plaza II and Geopolis (an indoor amusement park). |
| 1995/4 | Purchased a consolidated subsidiary, Mito Korakuen Co., Ltd. |
| 1996/5 | Started operating the Mito Korakuen Country Club. |
| 1997/2 | Established a consolidated subsidiary, Hokkaido Korakuen Kanko Kaihatsu Co., Ltd. |
| 1999/2 | Established a consolidated subsidiary, TOKYO DOME HOTEL CORPORATION. |
| 2000/3 | Established a consolidated subsidiary, Tokyo Dome Resort Operations Corp. |
| 2000/6 | Started operating Tokyo Dome Hotel.Started operating the Ichihara Korakuen Golf & Sports. |
| 2001/2 | Closed the Osaka Korakuen Hotel. |
| 2002/1 | Completed liquidation of a consolidated subsidiary, Osaka Korakuen Hotel Co., Ltd. |
| 2002/7 | Completed liquidation of a consolidated subsidiary, Atami Korakuen Co., Ltd. |
| 2003/5 | Started operating LaQua. |
| 2004/12 | Matsudo Kousan Co., Ltd. became a wholly owned subsidiary. |
| 2006/10 | Completed liquidation of equity-method affiliate RISOU Golf Service Co., Ltd. |
| 2006/11 | Transfer of all shares in consolidated subsidiary Korakuen Finance Co., Ltd. |
| 2006/11 | Completed liquidation of consolidated subsidiary SAN-ESU Factoring Co., Ltd. |
| 2007/5 | Planned business transfer of the Sapporo Korakuen Country Club; the Maiko Korakuen Ski Resort and Hotel; the Batoh Korakuen Golf Course and Hotel; the Mito Korakuen Country Club; the Ichihara Korakuen Golf & Sports Center; and the Kijima Korakuen Amusement Park, Hotel and Country Club. |
| 2008/3 | Started operating MEETS PORT. |
| 2009/4 | Reopened operating Geopolis (an indoor amusement park). |
| 2010/3 | Opened Splash Garden in Tokyo Dome City Attractions. |