To provide a temperature switch appropriately operated by suppressing diffusion of heat and detecting temperature with superior precision by means that surroundings of an exothermic electronic parts are surrounded and heat generated from the exothermic electronic parts is accumulated in the surrounded space.

The temperature switch 10 is provided with a base material 20 arranged so as to be opposed to the exothermic electronic parts 900 arranged at a substrate 700, a wall part which is installed at a face opposed to the substrate 700 of the base material 20, surrounds the exothermic electronic parts 900, and has a surrounding part 30 extended and formed in the substrate 700 direction, an elastic displacement part 31 displaced by the heat of the space formed at the surrounding part 30, and a switch part 50 in which a switching operation is carried out by displacement of the elastic displacement part 31 and from which signals are output.