The image forming apparatus includes a fixing device for heat fixing a toner image on a recording material, a discharge device for discharging the recording material on which the toner image is fixed by the fixing device; a blowing device for blowing air onto a lower surface of the recording material discharged by the discharge device; and a control device for controlling an amount of air blow from the blowing device in accordance with a position of the recording material discharged by the discharge device. Thus, it is possible to improve stacking alignment of the recording material while maintaining conveyance property of the recording material in a recording material sheet discharging section.