An image forming apparatus has an image carrier for carrying toner. A charger charges the surface of the image carrier and an exposure part then forms an electrostatic latent image thereon. A developer uses toner to develop the electrostatic latent image and a transfer part transfers a toner image from the image carrier to a recording medium. A cleaning roller has a circumferential surface that contacts with the surface of the image carrier and removes deposits therefrom by using toner that the circumferential surface carries. A carrier driver drives the image carrier and a power detector detects power consumption of the carrier driver. A roller controller determines, based on the detected power consumption whether a removal capacity of the cleaning roller to remove the deposits needs to be increased, and then controls rotation of the cleaning roller in response to a result of the determination.