An image forming apparatus includes a fixing device, a discharge roller pair, a cooling fan, a detection portion, and a cooling fan control unit. The discharge roller pair discharges a sheet on which a toner image has been fixed in the fixing device to a discharge tray via a discharge port. The cooling fan cools the sheet discharged on the discharge tray by blowing air thereto. The detection portion detects a rear end of the sheet being conveyed from the fixing device toward the discharge port. The cooling fan control unit performs control so that, within a prescribed period from a point in time of detection of the rear end of the sheet by the detection portion to when the rear end passes through the discharge roller pair, a rotation speed of the cooling fan is reduced to be lower than a reference speed used to cool the sheet.