This is a square tumulus built between the late 6th century and early 7th century, measuring 44.5m from east to west, 42.2m from north to south, with a horizontal stone chamber about 9.1m tall and 17m long.
同古墳は6世紀末から7世紀初頭に築造された方墳で、東西44.5m、南北42.2m、高さ約9.1m、全長17mの横穴式石室を持つ。