The tumulus is a large keyhole-shaped tomb mound with the front square part facing west and with the principal axis running exactly from east to west, whose total length was 140 meters with its rear round part being 72 meters in diameter, and it is the largest tumulus in Asuka-mura.
墳丘は前方部を西に向け東西に正確に主軸をとった前方後円墳で、全長約140m後円部径72mで、明日香村内では最大の古墳である。