It is estimated to date from the later half of the sixth century or the late seventh century. The burial mound is about 40 or 48 meters in diameter, nine meters in height, and the stone chamber the mound covers is sixteen meters in length. Excavation began in 1985. The tomb yielded gilt-bronze ornaments, horse trappings, and a stone coffin.
The tomb's Korean appearance is supplemented by the fact that the harness excavated in the tomb is a Korean import. Additionally, the native Japanese of the day did not known the "meaning of the ornamental patterns carved on saddle fittings" nor "how to make such fittings."