To provide a thermoswitch capable of reducing to minimum necessary a space for housing the thermoswitch, cost, and stress applied to an electric wire.

An electric wire guide 14 is installed on a case 11 of the thermoswitch 1. Furthermore, shapes of a plurality of terminals to supply power are aligned in an identical straight line shape and in an identical direction. In the thermoswitch 1 which is composed of a case 11 constituted of an insulating member, a power supply portion 12 connected to the electric wire and supplying power, and a temperature sensing portion 13 to detect a temperature, an electric wire guide 14 of the electric wire connected to the power supply portion is provided at the case 11. Furthermore, the power supply portions 12 are provided at two places or more, aligned in an identical straight line, and can be connected to the electric wires from an identical direction. Furthermore, the electric wire guide 14 has a structure to install a component for adding pressure in a vertical direction with respect to the temperature sensing portion 13.