To provide a method for manufacturing a resin coated DI processed can body excellent in quality and free from any film damage, in which the fabrication process can be simplified without any need for degreasing and cleaning after DI processing and the occurrence of film damage in the heating process can be surely prevented even in a high-speed fabrication line.

The forming of a can body by DI processing is performed by dry forming. A multiple-line distribution apparatus 10 is provided in the can body conveyance path through which a can body, the edge of whose opening part is cut off, is supplied to a heat set oven 7. Can bodies conveyed in a single line at a close spacing from one another are distributed by the apparatus 10 into multiple lines so that each can body may have space all around it, and then the can bodies are heated while they are conveyed separately in the multiple lines at such a space that they do not contact from one another in the heat set oven. By this heat set, stress of synthetic resin coating after forming of the can bodies is released.