To detect that holding by means of a holding means is intentionally unfastened before it is released by installing a detection means detecting the insertion of a release jig before the other end of a cord body in the holding means is released and a control means which selectively outputs an alarm to an alarm part, based on detection by the detection means.

When a normal release jig 35 is used and a locking pin 5 connected to the other cord body 3 is unfastened, an alarm output stop command radio wave is received by the antenna of an automatic ringing crime prevention tag. Even if the release jig 35 is temporarily inserted and a switch 45 operates, a buzzer 21 is prevented from ringing. When a third person is to intentionally unfasten it by using a jig made by copying the regular release jig 35, the buzzer 21 rings by the operation of the switch 45 and therefore the occurrence of theft is notified since the alarm output stop command radio wave is not received by the antenna of the automatic ringing tag.