PURPOSE: To prevent unauthorized manipulation for improved security by connecting an electronic lock system installed in a safe, etc., to a central monitoring room, for electronically monitoring the operation state of a lock and operation phases, etc.

CONSTITUTION: A dial-type electronic lock device 10 attached to a safe, etc., is connected to a remote central monitoring station 14 with a cable, for electronically monitoring the operation state of the lock and position of a bolt, etc. No changing of combination by a change key 40 is permitted without an appropriate control by the central monitoring station. If the lock is manipulated under unexpected conditions, it is displayed on a monitor so that quick response by a guard is can be made. Thus, a lock manipulation by an unauthorized person is prevented.