RESISTANCE HEATING UNIT

PROBLEM TO BE SOLVED: To provide a resistance heating unit which is capable of grasping the electrical properties of a thermistor even in use conditions where it is cyclically deceased or increased in temperature. SOLUTION: A resistance heating unit is provided on the surface of an insulating board 4, and a thermistor 1 with leads 2 is fixed on the rear of the insulating board 4 with a fixing member 3. The thermistor 1 with the leads 2 is electrically connected to the leads 2 by pressure-welding, and the electrically connected joints are sealed up with glass. A fixing means is that a metal plate 9 welded to a conductor 6 disposed on the rear of the insulating board 4 is bent to hold the thermistor 1.