ANTITHEFT TAG

PROBLEM TO BE SOLVED: To simplify a configuration and to reduce costs by providing a 1st alarm controlling part generating an alarm in response to the reception of an external signal and a 2nd alarm controlling part generating an alarm when a wire body is disconnected. SOLUTION: Lower and upper cases constituting a self-ringing type antitheft tag are connected by a wire 23. A radio wave detecting part 101 inputs an external output signal from an antenna and an external output signal from a releasing device. The signals inputted through the part 101 are inputted to a signal amplifying pare 113 through an input protecting part 107. The signals amplified by the part 113 are inputted to a waveform shaping part 127 to be subjected to waveform shaping and shaped into a pulse signal as well as being amplified to be outputted to a CPU 10. The CPU 10 rings a buzzer 7. When the wire 23 is disconnected, an oscillation circuit 95 performs oscillation, and the buzzer 7 rings through a buzzer driving circuit 89.