Abstract: A toner recovery roller having at least its outer peripheral part made of an insulator and rotated and driven in a predetermined direction is disposed in the vicinity of a position where an image carrier and a developing roller interact with each other, and a triboelectric charging member for triboelectrically charging an outer peripheral surface of the toner recovery roller to a polarity opposite to that of toner particles is so provided as to be brought into contact with the outer peripheral surface of the toner recovery roller.The rotation of the toner recovery roller in a predetermined direction causes friction between the friction charging member and the insulating outer peripheral surface of the toner recovery roller, so that the insulating outer peripheral surface of the toner recovery roller is triboelectrically charged to a polarity opposite to that of toner particles. Therefore, toner particles scattered from the developing roller are attracted to the toner recovery roller to adhere thereto.