Abstract: In a heating roller for fixing which is constituted such that a heating resistor 3 is provided onto an inner circumferential surface 1a of a cylinder 1 with an insulating layer 2 lying therebetween and a cleavage layer 6 is provided onto an outer circumferential surface, electrical insulating properties of the insulating layer 2 are maintained satisfactorily for a long time. A maximum height (Rmax) of surface roughness of the inner circumferential surface 1a of the cylinder 1 is in the range of 0.8 of 50 &mgr;m. A resistance value in the heating roller for fixing is partially adjusted easily. In a heating roller for fixing having a heating resistor 103 on a surface of a cylinder 101 with an insulating layer 102 lying therebetween, the heating resistor 103 is divided into a plurality of zones in an axial direction of the cylinder 101, and slots for adjusting resistance are formed in each zone.

Abstract: In a heating roller for fixing which is constituted such that a heating resistor 3 is provided onto an inner circumferential surface 1a of a cylinder 1 with an insulating layer 2 lying therebetween and a cleavage layer 6 is provided onto an outer circumferential surface, electrical insulating properties of the insulating layer 2 are maintained satisfactorily for a long time.A maximum height (Rmax) of surface roughness of the inner circumferential surface 1a of the cylinder 1 is in the range of 0.8 to 50 .mu.m.A resistance value in the heating roller for fixing is partially adjusted easily.In a heating roller for fixing having a heater resistor 103 on a surface of a cylinder 101 with an insulating layer 102 lying therebetween, the heating resistor 103 is divided into a plurality of zones in an axial direction of the cylinder 101, and slots for adjusting resistance are formed in each zone.