The first tomb has a room with Dohari-tanshitsu structure (single room with a womb-like structure), the second tomb has a room with Katasodesiki-tanshitsu structure, and the third tomb has a room with the Musodesiki-chohokei-tanshitsu structure.
1号墳は胴張り単室、2号墳は片袖式単室、3号墳は無袖式長方形単室である。