A square mound about 45m on a side in Hamadera Motomachi, Nishi-ku, Sakai, built in the mid-5th century. It once formed the Yotsuzuka group with Kyozuka, Akayama, and Takatsuki Kofun. Its horizontal stone chamber has a 2.4 by 2.2m main room and a 0.5 by 0.9m passage. It is an Osaka Prefectural Historic Site.
Finds & research
The horizontal stone chamber yielded horse fittings, a cuirass, swords, iron arrowheads, magatama, and other beads; the wooden coffins contained a square-frame mirror with eight bosses and a Weizhi Sangong mirror. A 1994 investigation recovered cylindrical and shield-shaped haniwa from the moat.
Official status & archaeological view
Official status
It is privately owned and was designated an Osaka Prefectural Historic Site on 26 July 1993.
Archaeological view
A three-tiered square mound about 45m on a side and 4m high. A 1958 excavation identified a horizontal stone chamber and two directly buried wooden coffins. The chamber uses steeply corbelled split stone in a technique resembling pit-style chambers and represents an early form of the horizontal stone chamber in the Kinai region.
Field notes
Because the mound is privately owned, visitors should take care regarding entry and be considerate of nearby residents.