Seibu Lions Stadium, completed in 1979, stands as a significant sports facility in Tokorozawa, Saitama Prefecture. Designed by the Ikehara Laboratory, this outdoor athletic venue represents an important example of late 1970s Japanese sports architecture. The stadium was purpose-built to serve as the home ground for the Seibu Lions baseball team, reflecting the era's commitment to establishing dedicated professional sports facilities. Its design reflects practical considerations for baseball operations while contributing to the regional sports infrastructure. The facility remains a notable landmark in Saitama's architectural and sports history.