A cleaning unit includes a plurality of rotatable fur brushes (4a, b) which are arranged so as to adjoin in a downstream direction of a transferring process on a surface of a photoreceptor drum (1) and whose tips are in contact with the surface for removing residual toner on the surface, recovering rollers (5a, b, c) arranged so as to be in contact with the tip of each of the fur brushes (4a, b) for removing toner adhering to the fur brushes, and a charger (6a-d) for charging the fur brushes and the recovering rollers, wherein the fur brush arranged at the downmost stream side rotates at a lower speed compared to another fur brush arranged in the upstream side thereof, wherein a discharger (7) may further be provided for decreasing the charge of the residual toner, and wherein the charger charges the downmost stream side fur brush reversely to the uppermost stream side fur brush.