Patent ID: 8582998

Claim:
A fixing device comprising: a heating rotary member that has a resistance heating layer that generates heat when an electrical current is applied; a pressurizing rotary member that is brought into pressure-contact with an outer circumferential surface of the heating rotary member so as to form a fixing nip, through which a recording sheet on which an unfixed toner image has been formed passes for heat fixing; a pair of circular electrodes that are each circumferentially formed at a respective one of two positions on the outer circumferential surface of the heating rotary member, and feed an electrical power to the resistance heating layer, the two positions sandwiching a sheet passing region therebetween, wherein the electrodes are each metallic and formed of at least two electrode layers including a first electrode layer that is layered directly on the resistance heating layer and a second electrode layer that is an outermost layer, a difference in linear expansion coefficient between the first electrode layer and the resistance heating layer is smaller than a difference in linear expansion coefficient between the second electrode layer and the resistance heating layer, and the second electrode layer is more oxidation-resistant than the first electrode layer.