A process cartridge includes an image bearing member, a brush, and a supporting portion. The brush includes a base member having an elongated plate shape that extends in the longitudinal direction, a brush member including bristles provided on the front surface of the base member, and mounting portions formed at both latitudinal ends of the base member. The supporting portion includes holding portions that hold the mounting portions formed at the both latitudinal ends of the base member, thereby supporting the brush with respect to the image bearing member.