A copying machine 100 is provided with an image forming portion 115 for forming a toner image on a sheet, a fixing device 122 for applying heat to the sheet to fix the toner image on the sheet, a delivery portion 125 on which the sheet is delivered and stacked, heat exhausting fans 157 and 158 provided in the vicinity of the fixing device 122 and the delivery portion 125 for exhausting air in the surroundings of those 122, 125 from the right side 101b of the main body 101. There is provided air vents 162, 163 and 164 between the fixing device 122 and the heat exhausting fans 157, 158 and between the delivery portion 125 and the heat exhausting fans 157 and 158. Thus, heat of the fixing device 122 is exhausted to avoid the delivered sheet adhesion caused by the high temperature.