It was presumed that this huge tumulus was constructed in the latter half of the fourth century and that, with its length of 190 m, was the tomb of the head of a local ruling family concerned with the sea.
この巨大古墳は4世紀後半に築造され、墳丘長190メートルあり、海とのかかわりのある豪族の墓と推定されていた。