Around the end of the Yayoi period to the beginning of the Kofun period (tumulus period), Sobashira-shiki building (dug-standing pillar building with a pillar per ken (unit of distance between two pillars), grid type structure) with size of 2 ken x 2 ken emerged, and this became the main structure of a warehouse.
弥生時代末から古墳時代初頭になると、2間×2間の総柱式の建物が出現し、これが主要な倉庫の形態となる。