Nippon Gaishi Hall, Indoor sports arena in Minami-ku, Nagoya, Japan
Nippon Gaishi Hall is an indoor arena in Minami-ku, Nagoya, with a curved roof of closely spaced ribbed panels over a light grey facade and a band of rectangular windows near the top. Its main hall, a circular dome 100 m in diameter, seats 5,000 fixed plus 2,000 movable and 3,000 temporary places, about 10,000 in all. A tall metal sculpture with curved arms stands in front.
Built on the site of the former Teijin Nagoya factory, the gymnasium opened on 19 July 1987; the first concert in the hall was by Off Course on 4 and 5 August 1987. The "Rainbow" name came from the city's 1982 Rainbow Plan sports-promotion programme. NGK Insulators took naming rights from 1 April 2007, and the complex became NGK Sports Plaza on 1 April 2026.
The nickname "Rainbow" came from the city's 1982 sports promotion plan, Rainbow Plan. The hall's first concert was by Off Course on 4–5 August 1987. Since 2007 the NGK naming contract has renamed the complex, but IOC-governed events such as the 2026 Asian Games must use the official names.
The venue is easiest to reach from Kasadera Station, from which you can walk directly to the hall. Several hotels within walking distance offer accommodation options near the event space.
The main hall's roof is a true circular dome 100 m in diameter, built as a parallel-lamella structure using a program from NASA's Apollo programme; the design took 600 hours of calculation and yields a reverberation time of about 2 seconds.
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