Ancient tombs located throughout the hills of Banoyama. Consists of 24 tombs and 14 of them have been designated as national historic sites. Especially, tomb No.4 is a large keyhole shaped tomb built in the early Kofun period where artifacts including sankakuen-shinjuukyou(triangular-rimmed mirror with divine beasts) , gems, swords, jade armlets etc. have been discovered.