To provide a thermal switch type excessive temperature rise preventing device (thermoprotector, thermoswitch) with improved high speed response, operation stability, reliability, etc.

In the device, a part of the constituting part such as a moving pin 6b, a pin guide 6c and a thermoswitch housing 6d that are in contact with a thermal part 6a of the excessive temperature rise preventing device 6 is constituted from resin or base material where glass fiber is added to resin and particles 90 with lower thermal conductivity than the base material is dispersed inside the base material.