Drum unit capable of improving positioning precision of cleaner with respect to photosensitive drum

摘要

A drum unit includes: a first side plate; a second side plate; a photosensitive drum; a cleaner; a first frame; and a bearing. The first side plate has a first opening. The second side plate is spaced apart from the first side plate in a first direction. The photosensitive drum has an axis extending along the first direction and a first end portion in the first direction. The photosensitive drum has a circumferential surface. The cleaner is configured to clean the circumferential surface of the photosensitive drum. The first frame includes: a support portion configured to support the cleaner; and a wall portion having a second opening. The bearing is configured to support the first end portion of the photosensitive drum. The bearing extends through both the first opening and the second opening.