a process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus , includes an electrophotographic photosensitive drum ; developing roller for developing an electrostatic latent image formed on the electrophotographic photosensitive drum ; drum frame supporting the electrophotographic photosensitive drum ; a developing frame supporting the developing roller , the developing roller being movable relative to the drum frame between a contacting position in which the developing roller is in contact with the electrophotographic photosensitive drum and a spacing position in which the developing roller is spaced from the electrophotographic photosensitive drum ; a force receiving member , provided movably relative to the developing frame , for receiving an external force , wherein the force receiving member is capable of taking an operating position for moving the developing frame from the contacting position to the spacing position by receiving the external force , and a stand - by position retracted from the operating position ; an urging portion for urging the force receiving member from the stand - by position toward the operating position ; and an engaging portion for engaging with the force receiving member to hold the force receiving member in the stand - by position against an urging force of the urging portion .