A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the main assembly of the apparatus including a drum driving force transmitting portion and a main assembly coupling, said process cartridge comprising: an electrophotographic photosensitive drum; a developing roller configured to develop an electrostatic latent image formed on said electrophotographic photosensitive drum with a developer while being in contact with said electrophotographic photosensitive drum; a drum unit configured to support said electrophotographic photosensitive drum, wherein said drum unit is positioned relative to the main assembly of the apparatus when said process cartridge is set in the main assembly of the apparatus; a developing unit supporting said developing roller and movable relative to said drum unit between a contact position in which said developing roller and said electrophotographic photosensitive drum are in contact with each other to develop the electrostatic latent image and a spaced position in which said developing roller and said electrophotographic photosensitive drum are spaced away from each other; a drum driving force receiving portion, engageable with the drum driving force transmitting portion in a state in which said drum unit is set in the main assembly of the apparatus, configured to receive a drum driving force for rotating said electrophotographic photosensitive drum from the drum driving force transmitting portion, wherein said drum driving force receiving portion (g) is provided in said drum unit; characterized by a cartridge coupling, engageable with the main assembly coupling in a state in which said drum unit is set in the main assembly of the apparatus, configured to receive a movable member driving force from the main assembly coupling, said cartridge coupling being provided in said drum unit; a movable member movable relative to said developing unit by receiving the movable member driving force from said cartridge coupling to move said developing unit between the contact position and the spaced position. an electrophotographic photosensitive drum; a developing roller configured to develop an electrostatic latent image formed on said electrophotographic photosensitive drum with a developer while being in contact with said electrophotographic photosensitive drum; a drum unit configured to support said electrophotographic photosensitive drum, wherein said drum unit is positioned relative to the main assembly of the apparatus when said process cartridge is set in the main assembly of the apparatus; a developing unit supporting said developing roller and movable relative to said drum unit between a contact position in which said developing roller and said electrophotographic photosensitive drum are in contact with each other to develop the electrostatic latent image and a spaced position in which said developing roller and said electrophotographic photosensitive drum are spaced away from each other; a drum driving force receiving portion, engageable with the drum driving force transmitting portion in a state in which said drum unit is set in the main assembly of the apparatus, configured to receive a drum driving force for rotating said electrophotographic photosensitive drum from the drum driving force transmitting portion, wherein said drum driving force receiving portion (g) is provided in said drum unit; characterized by a cartridge coupling, engageable with the main assembly coupling in a state in which said drum unit is set in the main assembly of the apparatus, configured to receive a movable member driving force from the main assembly coupling, said cartridge coupling being provided in said drum unit; a movable member movable relative to said developing unit by receiving the movable member driving force from said cartridge coupling to move said developing unit between the contact position and the spaced position.