This specification discloses a cleaning device for removing a developer and dust adhering to a surface to be cleaned in an image forming apparatus. More specifically, the specification discloses a cleaning device characterized in that an elastic cleaning member bears against the surface to be cleaned in opposed relationship with the direction of movement of the surface to be cleaned and portion of the cleaning member which bears against the surface to be cleaned is of a small thickness which lessens the contact pressure force thereof relative to the surface to be cleaned which tends to be increased by reduction in the free length from the held portion of the cleaning member to the portion of the cleaning member which bears against the surface to be cleaned.