To provide vibration breakers which can be made to operate successively and accurately, following the vibration of an earthquake so as to successively cut off electrical paths.

The output (a) of a sensor 10 which detects a vibration is inputted to an amplification/attenuation factor regulation unit 12 and amplified/ attenuated in accordance with the set value of a sensitivity setting unit 13, which arbitrarily sets an operating seismic intensity. Only when the output (c) of the regulation unit 12 exceeds a threshold, a 1st comparison unit 14 generate digital signal outputs (d) which are integrated by an integration unit 15. Only when the output (e) of the integration unit 15 exceeds the set value of a time extention setting unit 17 which arbitrarily sets an operation detection time, a 2nd comparison unit 16 supplies the output (f) to a tripping circuit 18.