A process cartridge includes a casing and developer contained within the casing. The process cartridge also includes a photosensitive drum having an axis L1, with the photosensitive drum being rotatably supported in the casing to permit rotation about the axis L1, and a developing roller having an axis L1′, with the developing roller being configured to develop a latent image formed on the photosensitive drum with the developer, and with the developing roller being rotatably supported in the casing to permit rotation about the axis L1′. A coupling member is operatively connected to the photosensitive drum, the coupling member including a body having an axis L2, and the coupling member including at least one projection provided at an end of the body.