Seibu Dome
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| Former names | Seibu Lions Stadium (1979–1997) Seibu Dome (1998–2004, 2008-2015) Invoice Seibu Dome (2005–2006) Goodwill Dome (2007) |
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| Location | 2135 Kami-Yamaguchi, Tokorozawa City, Saitama |
| Coordinates | 35°46′6.6″N 139°25′13.80″E / 35.768500°N 139.4205000°ECoordinates: 35°46′6.6″N 139°25′13.80″E / 35.768500°N 139.4205000°E |
| Owner | Seibu Railway Company, Ltd |
| Operator | Seibu Recreation |
| Capacity | 35,655 (2007) 33,921 (2008) |
| Field size | Left Field: 100m (328.1ft) Center Field: 122m (400.3ft) Right Field: 100m (328.1ft) Outfield Fence Height: 3.2m (10.5 ft) - 4.37m (14.3ft) |
| Surface | Artificial |
| Construction | |
| Broke ground | July 1, 1978 |
| Built | March 31, 1979 |
| Opened | April 14, 1979 |
| Renovated | 2007–2008 |
| Expanded | July 7, 1997 – March 18, 1999 (roof construction) |
| Architect | Yoshiro Ikehara (Stadium) Kajima Construction Corporation, Ltd. (roof construction) |
| General contractor | Seibu Constructions (Stadium) Kajima Construction Corporation, Ltd. (roof construction) |
| Tenants | |
| Saitama Seibu Lions (1979–present) | |
Seibu Dome (西武ドーム Seibu Dōmu?) (originally named Seibu Lions Stadium) is stadium located in Tokorozawa, Saitama,Japan. It is the home field of the Saitama Seibu Lions professional baseball team.
The stadium has a roof over the field and the stands, like other indoor ballparks. However, it lacks a wall behind the stands so that natural air comes into the field. This makes it possible for home runs to leave the stadium, something not possible in typical domed stadiums.
The stadium was built in 1979 without the roof and named Seibu Lions Stadium (西武ライオンズ球場 Seibu Raionzu Kyūjō?) as the new home field of the Lions that moved from Fukuoka to Tokorozawa that year. The installation of the roof took place in two phases: the first phase after the 1997 season, and the second phase after the 1998 seasons. At the beginning of the 1998 season, the stadium was renamed Seibu Dome although the domed roof had not completed yet.
On March 1, 2005, the stadium was named Invoice Seibu Dome (インボイスSEIBUドーム Inboisu Seibu Dōmu?) as Invoice Inc. bought the naming rights of the stadium for the next two seasons. Upon expiration of the previous contract, on January 1, 2007, the name was changed again to Goodwill Dome (グッドウィルドーム Guddowiru Dōmu?) to reflect the sponsorship of Goodwill Group, Inc. The naming rights contract with Goodwill was intended to remain in effect for five years.
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