To aim at stability for a long period and reduction of size of a thermoprotector operated by releasing through fusion of a fusible body elastic distortion energy of an elastic body stored by joining and fixation of a fusible material like solder.

A pair of lead conductors 1, 10 facing each other are arranged. Parallel parts are formed in a manner that a tip part of one lead conductor 1 crosses that of the other lead conductor 10. A conductive elastic body 2 is compressed in a longitudinal direction between the parallel parts, and one end part 210 of conductive elastic body is joined in plane to the tip part of the lead conductor 10 through a conductive fusible material 3 in a state that the conductive elastic body 2 is deformed in curving. The other end part 201 of the conductive elastic body 2 is folded back at the tip part of the lead conductor 1, and the folded part 201 is connected to the tip part of the lead conductor.