PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS

A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, wherein the main assembly includes a first rotatable main assembly drive transmission member, and a second rotatable main assembly drive transmission member, the process cartridge comprises an electrophotographic photosensitive drum; a developing roller for developing an electrostatic latent image formed on the electrophotographic photosensitive drum with a developer; a drum coupling member, provided on one axial end of the electrophotographic photosensitive drum, for engaging with the first main assembly drive transmission member and transmitting a first rotational driving force to the electrophotographic photosensitive drum, when the process cartridge is mounted to the main assembly of the apparatus along an axial direction of the electrophotographic photosensitive drum; and a shaft coupling member that includes a driving side engaging portion for engaging with the second main assembly drive transmission member and receiving a second rotational driving force, when the process cartridge is mounted to the main assembly of the apparatus, and a driven side engaging portion for transmitting the second rotational driving force from the driving side engaging portion to the developing roller; wherein the engaging portion is configured to be movable relative to the driven side engaging portion in a direction crossing with the axial direction of the developing roller, and the process cartridge further comprises a holding portion for holding the driving side engaging portion such that a rotational axis of the driving side engaging portion is deviated from a rotational axis of the driven side engaging portion in the crossing direction.