PURPOSE: To prevent an image surface and the rear surface of a transfer mate rial from being soiled by the toner.

CONSTITUTION: The image forming device provided with the fixing roller 1 held in press contact with the transfer material on which the toner image is formed, for fixing by fusing the toner image on the transfer material, the heating means for heating the fixing roller 1, and the cleaning member feeding means (feeding shaft 5) for feeding the cleaning member (cleaning web 4) to wipe clean the toner stuck on the fixing roller 1, is equipped with the fixing roller temp. detection means (thermistor 3) for detecting the temp. of the fixing roller 1, and the operation determination means for performing the operation determination of the cleaning member feeding means and the operation determination of the fixing roller 1, based on the temp. detected by the fixing roller temp. detection means 3. Moreover, the device is provided with the heat control means for starting the heating of the fixing roller by the heating means, after the completion of the processing of the cleaning member feeding means and the fixing roller, based on the determination result of the operation determination means.