To achieve cost reduction by adopting a constitution wherein two kinds wire-wound thermometers are inserted into a container all together so that the results of the measurements agree with each other, and by decreasing the processing of the container for inserting and attaching the wire-wound thermometer into the container in an oil-tight mode.

A dial-thermometer type heat sensitive part 31 and a temperature measuring resistor 32, which is the resistor-type heat sensitive part, in the wire-wound thermometer 3 are contained in one heat sensitive tube 34. A heater 33 for simulating the temperature rising amount of the winding is provided at the outside of the heat sensitive part 31 and the temperature measuring resistor 32. Then, one heat sensitive tube 34 can be attached and inserted into a container 10 of an oil-filled induction electric device. Therefore, the difference in measured values caused by the difference of the attaching positions is eliminated. Furthermore, since the attaching part of the winding thermometer becomes only one part, the processing works for the hole and the washers of the container for attaching become one half, and the cost reduction of the oil-filled induction electric device is promoted.