Light for curing an image on a can body is inhibited from reaching an image formation means. An upstream-side restricting wall 31 is positioned on the upstream side (the side on which an inkjet head 240 is provided) of a can body 10 when the can body 10 is stopped at a mandrel stop location 811 (light irradiation stop location 811). The upstream-side restricting wall 31 is thereby positioned between the can body 10 and the inkjet head 240, and an ultraviolet beam is restricted from facing the inkjet head 240.
