In 1936, the stone burial chamber was discovered by local residents in the Tsuruyama Hills, 500 meters south of JR West Akō Line Kagato Station.

Fukiishi and a row of cylindrical haniwa can be seen on the surface of the mound, and on the southeastern side is a 15-meter-wide extension.

Inside the burial chamber was a house-shaped sarcophagus, also made from white tuff from what is now eastern Kagawa Prefecture.

From these items and the structure of the tumulus, it is estimated to have been built in the latter half of the 4th century in the early Kofun period.

Fifteen of the surviving excavated artifacts were collectively designated a National Tangible Cultural Property in 2019.