The Seibu Dome, also known over the years by sponsorship names such as the MetLife Dome and currently the Belluna Dome, is a famous indoor baseball stadium. It is important to note that this iconic facility is located not in Sagamihara, but in the city of Tokorozawa, Saitama Prefecture, Japan. The arena serves as the home field for the professional baseball team, the Saitama Seibu Lions, and is a major center for the region's sporting life.

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An architectural feature of the Seibu Dome is its unique domed roof. Unlike many fully enclosed stadiums, the Seibu Dome's dome does not fit tightly against the stands, leaving a gap that creates the effect of an "outdoor stadium under a roof." This provides natural ventilation and a special sense of presence, combining the comfort of an indoor facility with the atmosphere of a traditional stadium.
In addition to exciting Pacific League baseball matches, the Seibu Dome regularly hosts other large-scale events. It features concerts by popular Japanese and international performers, exhibitions, festivals, and other cultural and entertainment events that attract thousands of spectators. The arena's capacity allows it to organize events at the highest level.
For tourists, visiting the Seibu Dome can be a vibrant experience. It is an opportunity to immerse yourself in the atmosphere of Japanese baseball, which is one of the most popular sports in the country, or to catch a grand show. Even if you are not a fan of baseball, the architecture of the stadium itself and the energy of the events held here make it an interesting site for getting to know the modern culture of Japan.