LOCKING CHECKING APPARATUS

PROBLEM TO BE SOLVED: To provide a detecting radio-wave transmitting unit 30 for a locking checking apparatus which detects unlocking of a window, the locking checking apparatus being set at a window frame without being aware of its setting by an invader. SOLUTION: The detecting radio-wave transmitting unit 30 is set in a case 36 which is fixed to the window frame. The case 36 also houses therein a sensor formed of a reed switch 56 and a magnet 54, and a transmitter 48. When releasing of a window lock is detected by the sensor, the transmitter 48 transmits detecting radio waves from the rotary lock lug 32 as an antenna. The rotary lock lug 32 axially supported in an opening of the case 36 is insulated from the case 36 by means of an insulation bush 38 and an insulation washer 34.