To provide a temperature sensor which can prevent a short circuit mode at the time of over-voltage impression and can prevent a lead wire also from contacting the other electronic component and a circuit or the like.

The temperature sensor is provided with a thermistor element 2 having a pair of electrodes, a pair of lead wires 3 of which one end is connected to the pair of electrodes by a solder material and has an elastic force, a support member 4 which is installed on the pair of lead wires 3 and formed of an insulating material holding these spacing, and a resin sealing part 5 formed of a thermoplastic resin which seals the one end of the pair of lead wires 3 and the thermistor element 2 and is softened at a melting point temperature or less of the solder material. An energizing force is added to at least one end side of one of the pair of lead wires 3 in the direction of widening mutual spacing of the pair of lead wires 3.