To provide a sure lock control system at a low cost by incorporating a sensor and a communication equipment into a lock and receiving lock information by means of a control device disposed at another location.

A lock checking sensor 9 and a radio control communication equipment 10 are mounted to all locks. And a lock for reporting use receives judgment demand signals outputted from a lock having control function to examine conditions of the sensor 9. Nothing is done if locking is completed. In the case of a poor locking, a bad judgment signal is outputted from a transmitter to report it to a lock having control function. The judgment signal is outputted only at the time during which judgment requirement outputted from the lock having control function is being received. And the lock for reporting use receives the judgment demand and sends back a poor lock signal, following which an alarm is displayed, so that the occurrence of poor lock in a building can be checked. Consequently, judgment can be made at a final stage of locking action in the building and hence poor locking can be checked without omission.