PURPOSE: To easily discover a thieved car in a short time, in case of encountering a robbery accident of the car, if the driver turns on a switch to escape to the outside of the car, by both sounding an alarm after a certain time and stopping an engine, even if the robber rides on the car to escape.

CONSTITUTION: If a main switch S1 is turned on, a switch S2 is simultaneously turned on. Under this condition, in case of encountering a robbery accident, if the driver turns on a foot switch S3 or switch S4 in the assistant driver's seat to open a door and go outside of a car, a door switch S5 is turned on to excite a solenoid coil R1, close a contact r1, excite a solenoid coil R2 and close a contact r2. When the robber closes the door to escape, the switch S5 is turned off to release excitation of the coil R1 to open the contact r1, close a contact r1', excite a solenoid coil R3 and close a contact r3. Accordingly, a delay element A is operated, after a certain time, a solenoid coil T1 is excited to turn on a delay switch t1, excite a solenoid coil R4 and close a contact r4 in a horn circuit, thus an alarm is sound simultaneously a contact r4' is opened to stop an engine.