PURPOSE: To make improvements in a property of facility by installing a nonvolatile memory, a state information reader or the like in the operating part of a remote control device for locking and unlocking operations by means of radio operation, and making a lock sate checkable at a remote place.

CONSTITUTION: A lock-unlock switch 11 is pushed first and foremost, If so, an internal power source is turned on just like as an ordinary case, and thereby a lock control signal or unlock control signal is produced there, whereby a timer operates as long as several seconds, but this time, it is a specific switching operation in a state of being so separated distant, insomuch that no communication to the side of a receiving unit 3 can be done, so the receiving unit 3 side shows no reaction at all, and a key unit 2 comes to such a condition as receiving no response signal in consequence. In this state like that, a central processing unit 13 unctions as a state information reading means, reading final lock state information or unlock state information stored in a nonrandom access memory 15, and a voice of the information contents is emitted through a speaker 16. Accordingly, a user is easily able check whether it is locked or not even at a place apart from a car by only operating its own unit 2 without returning to the car place.