However, most of the rectangular portion of the structure was destroyed during the construction of the Obama Line railroad in August 1916, and only the posterior circular portion of tumulus survives isolated in the middle of a rice field.

The burial chamber had a height of 1.5 meters and was painted red with cinnabar.

Bronze mirrors, possibly of Chinese origin, magatama and cylindrical beads, gold earrings, metal belt fittings, horse ornaments, and weapons including swords, spears and fragments of armor were found, all of which are currently in the possession of the Museum of the Imperial Collections in Tokyo.

Judging from these artifacts, the tumulus was constructed in the late 5th century AD (the middle Kofun period), and it has been speculated that this is the tomb of Kashiwade-no-Omi Ikaruga, which is mentioned in the Nihon Shoki as one of the Kuni no miyatsuko of Wakasa Province.

The tumulus is located about 30 minutes on foot from Kaminaka Station on the JR West Obama Line.