Detailed research has not been performed yet particularly on the stepped construction of the tumulus, but the studies suggest several options for the detail of the step that; Two-stepped rectangular frontage and three-stepped circular rear-end; three-stepped rectangular frontage and three-stepped circular rear-end; three-stepped rectangular frontage and four-stepped circular rear-end.
墳丘の段築については、詳しい調査が行われていないが、前方部二段築成・後円部三段築成、前方部三段築成・後円部三段築成、前方部三段築成・後円部四段築成　等の説がある。