PURPOSE: To provide an earthquake-sensitive automatic power supply interrupting device which can be easily, safely, and reliably fitted to a plug socket installed to an ordinary house, etc., and is not easily reset after power supply is interrupted.

CONSTITUTION: When an earthquake-sensitive switch 10 detects the switch 10 outputs an interrupting signal and an FF 12 holds the interrupting signal, and then, a relay 14 is driven by the output of the FF 12 and interrupts power supply. When a reset switch 4 is pressed thereafter, the FF 12 stops outputting and the relay 14 supplies electric power to the FF 12. A plug which is inserted into a plug socket and a receptacle to which the electric power outputted from the relay 14 is supplied are provided in a storing means which stores the earthquake-sensitive switch 10, FF 12, reset switch 4, and relay 14.