of the induction heating roller unit 21 and the recording medium 23 is transported by being held between them with pressure the toner 24 is deposited onto the surface of the recording medium 23 to form an image these components except for the recording medium 23 are mounted on the frame 25 in a predetermined positional relationship in the fixing device the recording medium 23 on which the toner 24 is deposited to form an image is inserted between the heating roller hr of the induction heating roller unit 21 and the pressure roller 22 during transportation and the toner 24 is heated by the heating roller hr and molten and thus thermally fixed to the recording medium 0125 fig6 is a schematic cross sectional view of a copier which is one embodiment of an image forming apparatus according to the invention in this drawing reference numeral 31 denotes a reader device reference numeral 32 denotes image forming means reference numeral 33 denotes a fixing device and reference numeral 34 denotes image forming apparatus case the reader device 31 optically reads an image on an original and produces an image signal the image forming means 32 forms an electrostatic latent image on a photosensitive drum 32 a in accordance with the image signal.