The square front of Hashihaka-kofun Tumulus is similar in shape to the projecting portion of the Makimuku Ishizuka Tomb, which is covered with a heap of earth and is considered older than Hashihaka-kofun Tumulus.
箸墓古墳よりも古いと考えられている纏向石塚墳丘墓などの突出部と箸墓古墳の前方部との形状が類似していること。