To make a string wire flexible and to reduce the cost by permitting the string wire to generate an alarm circuit by disconnection and movement.

The alarm circuit 42 is made to be non-conductive by the non- contact of electric contactors 36 and 37 where electrically insulating string wire 31 connecting objects are disposed interposedly. Since the wire 31 is wound by disconnection, the electric contactors 36 and 37 are brought into contact, the alarm circuit 42 is connected and an alarm is issued. An electric circuit 42, a winding tool and the contactors 36 and 37 are arranged inside casing main bodies 1 and 2. The casing main bodies are fixed to an in-store exhibition object or the like and the other end of the string wire 31 is fixed to the in-store fixing object. When the exhibition object is unnaturally carried for more than a fixed distance, the string wire 31 is disconnected. The wire 31 is provided with a stopper 21 so as to prevent the winding of the whole of it. A hook can be commonly used as the stopper 21.