A process cartridge that is detachably mountable to a main assembly of an electrophotographic image forming apparatus includes a drum unit supporting an electrophotographic photosensitive member and a developing unit supporting a developing roller. The developing unit is movable relative to the drum unit between a contacting position in which the developing roller is contacted to the electrophotographic photosensitive member and a spaced position in which the developing roller is spaced from the electrophotographic photosensitive member. The process cartridge further includes a positioning portion and a space maintaining member, with the space maintaining member retracting from the positioning portion to move the developing unit from the spaced position to the contacting position.