Some scholars (such as Yoshiro KONDO) point out that the rear has four terraces and a small knoll (on which it is believed that a clay platform, whose diameter and height were approximately 44 to 46 and 4 meters, respectively, and special vessel stands were placed) on top of the terraces.
後円部は四段築成で、四段築成の上に小円丘（径約44～46メートル、高さ4メートルの土壇、特殊器台が置かれていたと考えられる）がのったものと指摘する研究者（近藤義郎等）もある。