Structurally, the main hall consists of two buildings of Yosemune-zukuri (a square or rectangular building, covered with a hipped roof) including the shodo hall of seven ken wide by four ken deep (ken is an architectural term representing the number of intercolumniation space between two columns and not a unit of distance) and the raido hall of nine ken wide by four ken deep that have been interconnected by the ainoma of one ken deep, presenting a convex plane view.
構造的には正面7間、奥行4間（「間」は長さの単位ではなく、柱間の数を示す建築用語）の正堂と、正面9間、奥行4間の礼堂という2つの寄棟造建物の間を、奥行1間の「合の間」でつないだ形になり、平面は凸字形になる。