Image heating apparatus

An image heating apparatus comprising:

• an exciting coil;
• a current applying device configured to apply a high-frequency current of 10 kHz to 100 kHz in frequency to said exciting coil;
• a heating roller configured to heat a toner image on a recording material at a nip, said heating roller including (i) a metal core for generating heat by electromagnetic induction of magnetic flux from said exciting coil and (ii) an insulating surface layer provided on the metal core and having a volume resistivity of 1016 Ω·cm or more;
• a pressing roller configured to press-contact said heating roller to form the nip, said pressing roller including an electroconductive surface layer having (i) a width so as to be electrically insulated from the metal core by the insulating surface layer and (ii) a volume resistivity of 103 to 1013 Ω·cm;
• a diode configured to be connected between the metal core and the ground in a direction in which a surface potential of said heating roller has an identical polarity to a normal charge polarity of a toner;
• and
• another diode configured to be connected between the electroconductive surface layer and the ground in a direction in which a surface potential of said pressing roller has an opposite polarity to the normal charge polarity of the toner.