To provide a vibration breaker for cutting off a power source due to vibration of an earthquake by connecting a breaker lever to a dead weight mounted on a pan by a thread.

When a dead weight 1 mounted on a pan 4 for the weight is fallen by vibration of an earthquake, a lever 3 of a power source breaker 5 attached to a distribution board 6 by a thread connected to the weight 1 is lowered and the power source is cut off. The power supply breaker 5 can be thus automatically cut off by the vibration of the earthquake so that, when a refugee returns home from a refuge, the power supply can be energized, after he or she confirms whether gas is leaked or not caused by breaking of a gas pipe and electric appliances such as electric refrigerator are broken or not. This constitution can prevent a fire occurring simultaneously by gas leakage caused by breaking of the gas pipe which catches fire from spark of a motor of an electric appliance.