Patent ID: 7132924

Claim:
A construction machine comprising: a machine body; an engine that serves as a power source for the machine body; a key-removal detecting device detecting removal of the engine key after the engine is stopped; a posture detecting device detecting a posture of the machine body; and an anti-theft unit outputting an alarm signal in cases where an upper structure machine body from which the engine key has been removed is not in a given, proper parking posture, said anti-theft unit comprising: a unit mounting portion in which the anti-theft unit is installed and which is provided at such a location that it is inside the bottom portion of the upper structure and faces the undercarriage when the machine body is in a given, proper parking posture, and a cover for closing off the unit mounting portion from underneath; wherein the anti-theft unit is designed to force the engine to stop and output an alarm signal when the construction machine from which the engine key has been removed is no longer in a given, proper parking posture as a result of unauthorized start-up of the engine.