PURPOSE: To prevent a false information of an invasion alarm and increase reliability, by making it possible to lock an electric door lock by means of an ID judgement device at the outside and manually operated lock at the inside respectively and by cutting off the actuation of invasion sensor on locking from the inside.

CONSTITUTION: A detecting sensor S is fitted at the window side W of a room R to detect that the window is opened and at the outside of the window of the room R at electric lock EK of a door D is locked or unlocked as the result read from an ID card and a card reader CR is equipped to put on or off the detecting sensor S. When the electrical lock EK of the door D is locked by the actuation of an ID judgement device, the detecting sensor S is under a set condition and when the electrical lock EK of the door R is locked, interlocked with a locking motion of thumb turn within the room or a mechanical key without the room, the detecting sensor S is designed to turn to the released condition from invasion monitor and not to transmit an invasion alarm even if someone in the room opens the window after locked.