To guarantee a long-term stability and improve the reliability of operation of a thermo-protector operated by a release of an elastic strain energy of an elastic body supported by junction and fixation by a fusible body such as solder, caused by fusion of a fusible body.

Both ends 21, 22 of a laminated conductive elastic body 2 in a state of compressed in longitudinal direction is fixed to a lead conductor 1 serving as a framework, and the elastic body 2 is formed into convex curved shape, one end side of the convex curve is erected at a prescribed angle θL' to the framework 1, the other end 22 of the convex curve has a deflection angle 0, fixation of the one end part 21 of the elastic body and the framework 1 is carried out via a fusible material 3, an apex part of the convex curve is contacted with the other reed conductor 10, and the melting point or the softening point of the fusible body 3 is made to be an operation temperature.