The burial facilities of the back circular part is a pit stone chamber with its inside measurement approximately 8.3 meters in length, north small entrance 0.9 meters in width and about 1.7 meters in height, and the ceiling was built in a Gassho-zukuri style (an architect method with wooden beams combined to form a steep thatched roof that resembles two hands together) and corbelled out with flagstones from Mt. Kasuga and Mt. Shiba at the foot of Mt. Nijo.
後円部の埋葬施設は竪穴式石室で、内法長約8.3メートル、北小口幅0.9メートル、高さ約1.7メートルで、二上山麓の春日山と芝山の板石を持ち送りに積んで合掌造状の天井を作り出している。