01 / Jonoyama Tomb
In a boat-shaped coffin,a magatama of jade from Itoigawa.

The small hill known as Hitokago-yama and Otsuka-yama is an oval-shaped round tomb, 41 m east-west, 35 m north-south and 5 m high. In the 2012 investigation of the coffin, a boat-shaped wooden coffin about 8 m long yielded three yuki quivers and one dragon-pattern bronze mirror. The city records that the jade magatama and tubular beads are of jade from Itoigawa.
- 41 m by 35 m
- Boat-shaped coffin, about 8 m long
- 3 quivers, 1 bronze mirror
