is an indoor sporting arena located in Kadoma city in the Osaka Prefecture of Japan.
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 aluminum frames and covers an area of approximately 25,000 m<sup>2</sup>. 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.
The purpose of the arena changes with the seasons.