FIXING DEVICE AND IMAGE FORMING APPARATUS, AS WELL AS, HEATING ELEMENT

PROBLEM TO BE SOLVED: To prevent increase in temperature of a fixing roller at a non-paper passing area, improve the durability of the fixing roller, and reduce the heat capacity thereof.SOLUTION: The fixing roller 32 is pressure-contacted with a pressure roller mutually to form a fixing nip. The fixing roller 32 is configured, such that a heating unit 32B is layered on the roller body 32A. The heating unit 32B has: a magnetic resin layer 32c, in which a magnetic material whose Curie temperature reaches a predetermined temperature is dispersed uniformly in resin materials; a heating layer 32d closely layered on the circumference surface of the magnetic resin layer 32c; an elastic layer 32e layered on the circumference surface of the heating layer 32d; and a release layer 32f layered on the circumference surface of the elastic layer 32e. The heating layer 32d generates heat by the magnetic flux generated by a magnetic flux generating unit.