Patent ID: 7711305

Claim:
A fixing device comprising: a fixing roller which has an elastic layer and an internal heating member, and rotates; an endless fixing belt which rotates with the fixing roller; a pressure member which presses the fixing belt against the fixing roller from an inner peripheral surface side of the fixing belt; a sliding sheet placed between the fixing belt and the pressure member; and a lubricating agent supplying section which supplies a lubricating agent to the inner peripheral surface of the fixing belt, a toner image being fixed onto a recording media at a nip portion formed between the fixing roller and the fixing belt, wherein the inner peripheral surface of the fixing belt and a surface of the sliding sheet are formed of polytetrafluoroethylene, wherein the following relation is satisfied: H 1 ≦H 2 , where H 1 is a surface hardness of the inner peripheral surface of the fixing belt and H 2 is a surface hardness of the sliding sheet facing to the fixing belt.