It is known that there was a 9.75-meter and 12.5-meter Kukei-dan with the estimated height of a slightly less than two meters with stuck stones located on the top of the back circular part, and Nijukoen Tsubogata doki earthenware were placed around the foot of the platform.
後円部の頂上には、高さ2メートル弱と推定される一辺9.75×12.5メートルの貼り石のある矩形壇が知られており、その壇の裾周りに二重口縁の壺形土器が巡らされている。