ALARM DEVICE FOR WORKING MACHINE

PURPOSE:To enable measures for safety to be effective and energy for entire device to be saved by detecting traveling or turning information for driving and controlling a specified transmission/reception equipment for detection and by driving and controlling an alarm buzzer as needed when detecting a target. CONSTITUTION:An operation information detection sensor 10A1 on a main body of a working machine detects and outputs traveling or turning information of a location where a transmission/reception equipment for detection is installed and a drive/control circuit for transmission/reception equipment 13 drives and controls a specified transmission/reception device for detection according to this output signal. Then, supersonic wave is transmitted from a supersonic transmission means 2 and a supersonic wave returning means 3 receives it and then returns a supersonic wave with a specified frequency. Then, receivers 311 and 312 for detection receive it, a signal selection circuit 321 eliminates noise, and a signal discrimination circuit 331 determines whether it is from the means 3 or not and at the same time it classifies a range and outputs signal. Then, an alarm control circuit 361 drives and controls buzzers 34A and 34B and hazard displays 35A1 and 35B1 based on this signal. Also, a control circuit for external device 37 stops operation of a working vehicle as needed.