To assure stability in temperature sensing by embedding a thermistor in an jacket of a fixed form without any offset and further by controlling a positional relation between the thermistor and a temperature measuring surface.

This temperature sensor is made up of an inside/outside double layer comprising an outside synthetic resin layer 1 and an inside synthetic resin layer 2, and the thermistor 3 and its lead wires, etc. are embedded in the resin layer 2. The resin layer 1 is the jacket of a fixed form with a circular cross section shape, and has the temperature measuring surface 5 on its end. The measuring surface 5 is a flat surface formed so as to make a right angle with the longitudinal direction of a circular trunk part 6 of the resin layer 1 as a surface used for measuring temperatures. The resin layer 2 is an amorphous synthetic resin layer made by coating/covering a part of the covering of a pair of lead wires 4 connected to the thermistor 3 and to electrodes of the thermistor and led out in one direction and that of outgoing lines 13 connected to the lead wires 4, and is embedded in the resin layer 1 on its center line.

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