To suppress wear caused by the deformation of a contact part between a temperature detection means and a fixing roller or the floating of a lead wire and to prevent the lead wire from being disconnected.

The detection sensor (temperature detection means) 1 brought into slidable contact with the fixing roller TR (rotating and moving cylindrical side wall surface) so as to detect temperature is provided with a cushion material piece (elastic member) 5 having a thermistor (temperature detection element) 6 at one end side of a leaf spring 2 whose other end is fixed and a resin molded part (supporting member) 4 near to the other end side from the piece 5. Then, the direction of a heat resistance sheet 7 set toward the piece 5 from the resin molded part 4 is regarded as an almost tangent direction with respect to the roller TR.