A cleaning device includes: a housing; a cleaning roller provided in the housing and operable to come into contact with a photosensitive drum; a cleaning blade operable to come into contact with a surface of the photosensitive drum at a position lower than a nip position between the cleaning roller and the photosensitive drum; and a toner guide plate disposed below the cleaning roller. The toner guide plate includes: a blade proximity portion in proximity to the cleaning blade; and a toner guide portion extending along an outer surface of the cleaning roller, spaced away from the outer surface of the cleaning roller by a predetermined gap. In the cleaning device, the surface of the photosensitive drum can be polished as required.