Motoinari Kofun

The mound is orientated to the south and stands at the southernmost tip of the Muko Hills, on the right bank of the Katsura River, on the southwestern edge of the Kyoto Basin. It borders the grounds of Muko Shrine. It is built in three tiers at the rear and two tiers at the front, and fukiishi roofing stones can be seen on the outside of the mound.

The burial facility is a pit-type stone burial chamber built in the centre of the posterior portion of the tumulus. Its main axis runs north-south, parallel to the main axis of the mound. It measures 5.56 meters long, 1.32 meters wide at the north side and 1.02 meters wide at the south side, and 1.9 meters high at the southern end. The floor is clay, with a rectangular platform topped by a layer of clay (painted red) and stone slabs. The walls are made of stone slabs, and the upper half is corbeled, with 11 ceiling stones.

Since 1960, a total of ten archaeological excavations have been carried out on the mound. The burial chamber has been looted, and the mound suffered large-scale grave robbery during the Edo period. Excavations nevertheless found remains of grave goods, including one bronze and seven iron arrowheads, three fragments of an iron sword and three fragments of spears, an iron ax and a shard of Haji ware pottery. A cluster of haniwa shards and jar-shaped pottery fragments was found in the centre of the anterior portion of the tumulus.