Osaka Municipal Central Gymnasium is made up of a main arena, sub-arena, judo hall, kendo hall, and large, medium and small conference rooms that can accommodate a wide variety of events and sporting matches. Built on the concept of harmony with nature, the gym is built around two lush green hills, and all facilities are located underground, making it a rare multi-purpose space in the world that uses a semi-underground system. It is fully equipped with a stage, large-scale audiovisual equipment, and lighting equipment that can accommodate a wide variety of events, as well as professional and amateur sports.