Drum unit, drive transmission unit, cartridge and electrophotographic image forming apparatus

Abstract

To accomplish engagement between a coupling member and a drive transmission member of main assembly. A drum unit includes a photosensitive drum and a coupling member which is provided adjacent to an end portion of the photosensitive drum and which is connected with the photosensitive drum so as to be capable of drive transmission the coupling member is inclinable relative to a rotational axis of the photosensitive drum, and an inclination angle relative to photosensitive drum is reduced with rotational driving operation.