This is an ancient burial mound from the 7th century located near the hondo, and it was almost verified that it is the tomb which belonged to the Abe clan, a local ruling family, and some opinions hold that it is the tomb of ABE no Kurahashimaro.
本堂近くにある7世紀中頃の古墳で、豪族安倍（阿倍）氏一族の墓であることはほぼ確実視され、安倍倉梯麻呂の墓であるともいわれる。