An image forming apparatus which uses a plurality of heat-fixing devices, and secures a fixing property and a high quality of image and on the other hand, suppresses electric power consumption and further, curtails the number of parts, and gives consideration to an environment and realizes a lower cost. The image forming apparatus includes an image forming portion which forms a toner image on a recording medium, and first and second fixing devices which heat-fix the toner image formed on the recording medium, and an exhaust heat route from the first fixing device passes via the second fixing device.