A cartridge attachable to and detachable from an image forming apparatus main body includes a rotating member, a supporting member configured to rotatably support the rotating member, a regulating portion configured to abut against an end surface of the rotating member in a rotational axis direction to regulate movement in the rotational axis direction, a hole portion configured to expose a portion of the end surface so as to enable a contact portion provided on the image forming apparatus main body to contact the end surface, a concave portion configured to retain grease, and a wall surface in the concave portion located at a downstream side in a rotation direction and provided such that an area of the wall surface that is farther from the hole portion than an area thereof that is closer to the hole portion is located at the downstream side of the rotation direction.