An electrostatic latent image is formed on an image carrier. A developing roller is separatably abutted on the image carrier at a developing position to supply toner onto the image carrier to make the latent image visible as a toner image. The toner image is transferred onto a transfer member. A cleaner is abutted on the image carrier to remove toner remained thereon. A toner supplier supplies toner onto the image carrier while the developing roller is separated from the image carrier.