A process cartridge (50; 950) detachably mountable to a main assembly of an electrophotographic image forming apparatus, comprising: an electrophotographic photosensitive drum; a developing roller for developing an electrostatic latent image formed on said electrophotographic photosensitive drum; a drum frame supporting said electrophotographic photosensitive drum; a developing frame supporting said developing roller, said developing frame being movable relative to said drum frame between a contacting position in which said developing roller is in contact with said electrophotographic photosensitive drum and a spacing position in which said developing roller is spaced from said electrophotographic photosensitive drum; and a force receiving member (70; 970) movable relative to said developing frame between a protrusive position in which said force receiving member (70; 970) is protruded from the developing frame and a stand-by position in which said force receiving member (70; 970) is retracted from the protrusive position toward an inside of the developing frame, said force receiving member (70; 970) being capable of receiving an external force to move said developing frame from the contacting position to the spacing position when said force receiving member (70; 970) is in the protrusive position; characterised by an urging portion (21; 921) for urging said force receiving member (70; 970) from the stand-by position toward the protrusive position; and an engaging portion (75b; 775b; 875b; 975b) for engaging with said force receiving member (70; 970) to hold said force receiving member (70; 970) in the stand-by position against an urging force of said urging portion (21; 921). an electrophotographic photosensitive drum; a developing roller for developing an electrostatic latent image formed on said electrophotographic photosensitive drum; a drum frame supporting said electrophotographic photosensitive drum; a developing frame supporting said developing roller, said developing frame being movable relative to said drum frame between a contacting position in which said developing roller is in contact with said electrophotographic photosensitive drum and a spacing position in which said developing roller is spaced from said electrophotographic photosensitive drum; and a force receiving member (70; 970) movable relative to said developing frame between a protrusive position in which said force receiving member (70; 970) is protruded from the developing frame and a stand-by position in which said force receiving member (70; 970) is retracted from the protrusive position toward an inside of the developing frame, said force receiving member (70; 970) being capable of receiving an external force to move said developing frame from the contacting position to the spacing position when said force receiving member (70; 970) is in the protrusive position; characterised by an urging portion (21; 921) for urging said force receiving member (70; 970) from the stand-by position toward the protrusive position; and an engaging portion (75b; 775b; 875b; 975b) for engaging with said force receiving member (70; 970) to hold said force receiving member (70; 970) in the stand-by position against an urging force of said urging portion (21; 921).