d the toner images superimposed on one another on the intermediate transfer belt 130 are transferred to a recording material i e transfer medium by a secondary transfer roller 41 the recording material p is accommodated into a recording material cassette 10 and is supplied therefrom to a secondary transfer section through a paper feed roller a plurality of conveying rollers and registration rollers 12 the intermediate transfer belt 130 comprises a dielectric resin sheet such as a polyethylene terephthalate resin sheet pet resin sheet a polyvinylidene fluoride resin sheet or a polyurethane resin sheet the intermediate transfer belt 130 may be a belt formed by superimposing opposite ends of the aforementioned dielectric resin sheet on each other and bonding them together into an endless shape or alternatively the intermediate transfer belt 130 may be a seamless belt the recording material p on which a toner image has been transferred is conveyed to a fixing unit 9 by a conveying section 62 a separation guide 64 is used for stabilizing the front end of the recording material p the fixing unit 9 includes a fixing roller 51 pressure roller 52 heat resistant cleaning members 54 and 55 for cleaning these fixing roller 51 and the pressure roller 52 respectively roller heaters 56 and 57 provided within the fixing roller 51 and the pressure roller 52 respectively an application roller 50 for applying a mold lubricant such as dimethyl silicone oil to the fixing roller 51 an oil reservoir 53 for this mold lubricant and a thermistor 58 for detecting the surface temperature of the pressure roller 52 in order to control the fixing temperature with regard to the recording material p to which four.