Tokyo Dome (Tōkyō Dōmu, TYO: 9681) is a 55,000-seat (actual capacity of 42,000) baseball stadium located in Bunkyo Ward of Tokyo, Japan. Construction on the stadium began on May 16, 1985, and opened for business on March 17, 1988. It was built on the site of the Velodrome which was next door to the site of the predecessor ballpark, Kōrakuen Stadium. Like Kōrakuen, the Dome hosts the Toei Superheroes live shows of the year.
Tokyo Dome's original nickname was "The Big Egg", with some calling it the "Tokyo Big Egg". Its dome-shaped roof is an air-supported structure, a flexible membrane held up by slightly pressurizing the inside of the stadium. It is the home field of the Yomiuri Giants baseball team, and has also hosted basketball, American football and association football games, as well as puroresu (pro-wrestling) matches, mixed martial arts events, kickboxing events, monster truck races, and music concerts. It is also the location of the Japanese Baseball Hall of Fame which chronicles the history of baseball in Japan.
Under the ground rules set up by the dome, any ball which hits or is trapped by the hanging items in outfield area's roof will be ruled as home runs. Hitting any other part of the roof will be considered as in-play. In addition, prize money will be given out if any home run hits the advertisement boards in the scoreboard.