[1] It is the largest burial mound in the Shikoku region, and is estimated to have been built around the middle of the 5th century (the latter half of the early Kofun period).

Numerous fragments of haniwa, including cylindrical, morning glory-shaped, and house-shaped have been found on the surface.

A Shinto shrine was built on top of the mound, and a Buddhist chapel on the east side of the posterior circular portion.

Local records indicate that the ceiling stone of the burial chamber was dug out in an attempt to build a sumo ring on the top of the round part of the mound in the Meiji period.

In subsequent investigations, three additional hōfun [ja] (方墳) square tumuli were discovered on the southwest and west sides of the burial mound.