It is the center of a cluster of approximately 80 burial mounds facing the Genkai Sea on a hill with an elevation of about 42 meters.

The horizontal-entry cave-style stone burial chamber is a multi-chambered structure in the center of the posterior circle, opening to the west.

The pillar stones and back wall are divided into sections with a triangular pattern made of vertical, horizontal, and diagonal line carvings, and each section is painted with red, yellow, and blue pigments, and the upper part is painted red.

Judging from the structure of the burial chamber and the shape of the tumulus, it is believed to have been constructed in the 6th century, or the last Kofun period.

Although many decorated kofun have been found along the coast of the Ariake Sea in the Kyushu, this is the only one to have been found in along the coast of the Genkai Sea, and its presence outside the distribution area for decorative kofun suggests cultural or political interaction between the regions.