Time of construction: Judging from grave goods and burial facilities, it is thought to be a large keyhole-shaped mound in the period dating back some years to the period in which stylized large keyhole-shaped mounds typified by the Hashihaka-kofun Tumulus appeared, and therefore it is presumed to have been built in the era of Yamatai-Koku kingdom.
築造時期：副葬品や埋葬施設などから箸墓古墳に代表される定型化した出現期大型前方後円墳よりあまり遡らない時期の前方後円墳と考えられ、邪馬台国時代に築造されたと推測されている。