A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes an electrophotographic photosensitive drum (7); a drum gear provided at one longitudinal end of the photosensitive drum (7); a developing roller (10d) for developing with toner an electrostatic latent image formed on the photosensitive drum (7); a developing roller gear, provided at one longitudinal end of the developing roller (7), for meshing engagement with the drum gear to transmit a driving force, for rotating the developing roller (10d) from the drum gear (7); a cleaner container (13) supporting the photosensitive drum (7); a toner developing container (12) supporting the developing roller (10d); a coupling member for rotatably connection the cleaner container (13) and the toner developing container (12) with each other; an urging member for urging the cleaner container (13) and the toner developing container (12) coupled by the coupling member in the direction of engagement of the drum gear and the developing roller gear with each other; a tape (81) stuck continuously on the cleaner container (13) and the toner developing container (12) to maintain, against an urging force provided by the urging member, a state in which the drum gear and developing roller gear are disengaged from each other or in which a back clearance between the drum gear and the developing roller gear is larger than that during image forming operation.