Image forming apparatus

An image forming apparatus, to which a cartridge is detachably mountable, for forming an image on a recording material, said image forming apparatus comprising:

• a positioning portion that positions the cartridge;
• a movable member which is movable between a first position for positioning the cartridge to said positioning portion when the cartridge is mounted to a main assembly of said apparatus, and a second position, retracted from the first position, for permitting mounting of the cartridge to said main assembly of said apparatus in a longitudinal direction of the cartridge, wherein said movable member is provided with an urging member that urges and positions the cartridge to said positioning portion when said movable member takes the first position;
• a guiding member movable relative to said movable member to take a guide position for guiding the cartridge when said movable member takes the second position and to take a spacing position retracted from the guide position away from the cartridge when said movable member takes the first position, wherein said guiding member projects through an opening provided in said movable member at the guide position.