Movable member and image forming apparatus

A drum unit configured to be mountable on a main assembly of an image forming apparatus, and movable to the main assembly in a state in which a plurality of developing cartridges including developing rollers are mounted thereon, the drum unit comprising:

• a frame;
• a plurality of photosensitive drums including a first photosensitive drum rotatably supported by the frame;
• a charging wire extending along a rotational axial direction of the first photosensitive drum and configured to electrically charge a surface of the first photosensitive drum;
• and
• a cleaning member configured to be movable between an end portion of the frame on one side with respect to the rotational axial direction and an end portion of the frame on the other side with respect to the rotational axial direction along the charging wire in the rotational axial direction, and configured to clean the charging wire by moving while being in contact with the charging wire,
• wherein when the cleaning member is positioned at the end portion of the one side, of the plurality of the developing cartridges, a first developing cartridge corresponding to the first photosensitive drum is configured to be mountable on the drum unit,
• wherein the cleaning member includes:
• a base portion;
• a cleaning portion projected downward from the base portion in a case in which the drum unit takes a mounted attitude of being mounted on the main assembly and configured to contact and clean the charging wire;
• and
• a plurality of projected portions projected upward from the base portion in the mounted attitude and including a first projected portion which is projected highest from the base portion, and
• wherein an entirety of the first projected portion is provided at a position different from the cleaning portion in the rotational axial direction and the first projected portion is provided on a side close to the end portion of the frame on the one side relative to the cleaning portion in the rotational axial direction.