An image carrier unit includes an image carrier that carries a toner image developed with a developer containing a toner on a surface thereof before the toner image is transferred to a transfer member in a transfer region; a supply section that supplies a lubricant containing a fluorocarbon resin to a surface of the image carrier such that the weight fraction of the fluorocarbon resin contained in the lubricant supplied after a period of time has elapsed since a predetermined point in time is higher than the weight fraction of the fluorocarbon resin contained in the lubricant supplied at the predetermined point in time; and a removing member that is disposed in contact with the surface of the image carrier and that removes the developer remaining without being transferred to the transfer member from the surface of the image carrier.