A process cartridge for use with a main assembly of an electrophotographic image forming apparatus. The process cartridge includes a casing, a photosensitive drum having an axis L1, and a coupling member having an axis L2. The coupling member is movable between a first position in which the axis L2 of the coupling member is coaxial with the axis L1 of the photosensitive drum, and a second position in which the axis L2 of the coupling member is inclined with respect to the axis L1 of the photosensitive drum.