Tsukamawari Kofun is a round mounded tomb located adjacent to the outer moat of Nintoku-tenno-ryo Kofun [2-1], on its east side. It is considered to be related to Nintoku-tenno-ryo Kofun as a satellite tomb.
The mound’s diameter is 35 m, and its height is 4.5 m.
From an excavation in the early 20th century, bronze mirrors, single- and doubled-edged swords, and a large number of beads were found in the wooden coffin. The comma-shaped bead (maga-tama) made of jadeite and 5 cm in length is a particularly rare large item.
The construction period dates to the first half of the 5th century.