To provide a roll box palette fixing device during containerized transportation.

The roll box palette fixing device (1) during containerized transportation includes: a lashing belt (20) extended back and forth in the proceeding direction of an autotruck; a ratchet buckle (22) attached to one end of the lashing belt; and a fixing device body (24) attached to the other end of the lashing belt, wherein both of the ratchet buckle (22) and the fixing device body (24) are fixed to a side wall (10s), a pressing member (37) is gradually pressed toward the roll box palette (14) in the container by using the ratchet buckle and pulling the lashing belt (20) stepwise, and the roll box palette (14) is fixed from a side surface. After completion of transportation, the ratchet buckle (22) is disengaged and the lashing belt (20) is loosened. The ratchet buckle (22) and the fixing device body (24) can be attached freely attachably and detachably to a rail (16) disposed on the container side wall.