An image forming apparatus including a process cartridge detachably attached to a main body the apparatus, the process cartridge having an image bearing member, a processor device acting on the image bearing member, and, storage device for electrically connecting the main body to the process cartridge through a connector, biasing device for biasing the process cartridge in a connecting direction of the connector, and presence/absence detection device for detecting whether the process cartridge is mounted onto the main body, the detection device detecting the presence/absence of the process cartridge after the biasing device operates.