A picture of a pit house which is similar to the picture of House A, is carved on the ring pommel of an iron sword excavated from Todaijiyama Tumulus in Tenri City, Nara Prefecture.
このA棟と類似の竪穴式建物が奈良県天理市の東大寺山古墳から出土した鉄刀の柄の環頭に描かれている。