An image forming apparatus is supplied capable of lowering cost of exchange part. In the image forming apparatus, the exchange part is furnished being attachable and removable, an identification information obtaining process section to obtain identification information of the exchange part from the exchange part, and an operation allowing process section to allow image formation in the case that the identification information obtaining process section can not obtain the identification information, are comprised, so that it is unnecessary to provide an identification information storing portion for storing the identification information to the exchange part of shipment stage.