Construction was completed in early 1996. The primary architect was Mamoru Kawaguchi, founder of the firm Kawaguchi & Engineers. The dome is composed largely of reinforced concrete and steel frames and covers an area of approximately 25 000 m2. Inside is a main competition arena plus a separate swimming pool, training room, multipurpose hall, conference rooms and Restaurant Namihaya. The main arena has 6 000 fixed seats with a possible capacity for 10 000 people. There is a large screen display and a large electrical score screen.