To provide an image forming device capable of efficiently driving an exhaust device with an inexpensive constitution and preventing excessive temperature rise in process cartridge, and a process cartridge whose inside excessive temperature rise is detected on the image forming device side.

A temperature detection means 31 whose shape is changed according to the change of ambient temperature is provided in the image forming device 1 or the process cartridge 7. When temperature rises, the means 31 performs switching operation so as to control the driving and the revolving speed of the exhaust device 37. When the temperature rises in the cartridge, the carrying speed of a recording medium P is made low. Or a distance between the recording media P is shortened. Then, the means 31 whose shape is changed according to the change of the ambient temperature is provided in the cartridge 7. When the temperature rises, the means 31 performs the switching operation and an electrical signal therefrom is obtained by the main body side contacts 36a and 36b of the image forming device 1.