What is Tokyo Dome?

The most well-known in Tokyo Dome City and the first-ever all-weather, multi-purpose stadium in Japan.

Since the opening in 1988, all kinds of events have been held such as concerts, exhibitions, and not to mention baseball games.
It is an all-weather stadium, so you can utilize it, not worrying about weather.

Stadium Size

Area	Floor area ／ 46,755m² (This is what is usually stated when people say "the area of Tokyo Dome")
Volume	About 1.24 million m³
Floor	2 floors under ground ・6 floors above ground
Height	Highest point ／ 56.190m from the ground Height above baseball ground ／ 61.690m Baseball field surface ／ 5.500m under ground
Capacity	55,000 people（for baseball games, about 46,000 people）
Baseball Ground	Area／ 13,000m² Left and right fields ／ 100m To center outfield／ 122m Fence height／ 4m

Architecture

Membrane Roof

The membrane roof is made up of glass fiber membrane materials coated with fluoropolymers, which was created specifically for Tokyo Dome. It is supported by 28 cables and the total weight amounts to 400 tons. The membranes are two-layered, and the thickness of the inside layer is 0.35 mm and that of the outside 0.8 mm, which are so thin that about 5 percent of the sunlight goes through them.

Air-supported Stadium

Tokyo Dome is an air-supported structure, which supports the membrane roof with air pressure. Pressurized ventilation fans constantly send air inside the stadium so that the air pressure inside is 0.3 percent higher than that of outside, which supports the membrane roof. This difference in air pressure equals the one between a first floor and ninth floor. A body does not detect this difference. In addition, revolving doors are installed as entrances and exits in order for the air not to go out of the stadium.

Pressurized Ventilation Fan

A total of 36 fans are situated in the highest area of stands, surrounding Tokyo Dome.
For events, 10 to 18 fans are operated, but when it is closed, two fans are operating.

Revolving Door・Blanced Door

To maintain the air pressure inside Tokyo Dome, revolving doors are installed at entrances and exits (a total of 54 locations). Also, after baseball games or in case of emergencies, balanced doors (a total of 54 locations), functioning as supplementary to revolving doors, are used so that many people can enter or leave the stadium at the same time.