The present invention relates in order to prevent accidents caused by falling and falling, to provide a walking aid. A To detect than the step distance of the lower feet of the pedestrians, the ultrasonic signal transmitting and receiving make outgoing and reception of the reflected wave 27 that is reflected from the lower reflector of the ultrasonic signal 25 downward reflector 26 and part 2, the pulse signal of the reflected wave and the pulse signal generation unit 31 for outputting a pulse signal for distance measurement to the oscillation circuit 21 is output from the wave detection circuit 22 in the ultrasonic signal transmitting and receiving unit in the ultrasonic signal transmitting and receiving unit outputting a PWM signal corresponding to the distance detection function 33 that detects the step distance to the lower reflector than the time difference between the reception time T2 which is slightly delayed in the step distance from the originating time T1 of the input pulse signal receiving unit 32 and the pulse signal a control unit 3 having a PWM signal output function 34, a broadcast output unit 4 for driving the informing element 42 amplifies the PWM signal at the broadcast output driver 41, and the ultrasonic signal transmitting and receiving unit Constituting at the battery for supplying power to the broadcast output unit and control unit. .FIELD 1【課題】転倒や転落による事故を未然に防止するための、歩行補助具を提供する。【解決手段】歩行者の足元より下方の段差距離を検出するため、下方反射物26に向けて超音波信号25の発信と下方反射物より反射された反射波27の受信を行う超音波信号送受信部2と、超音波信号送受信部内の発振回路21に対して距離計測用のパルス信号を出力するパルス信号発信部31と超音波信号送受信部内の受振回路22より出力される反射波のパルス信号を入力するパルス信号受信部32とパルス信号の発信時間T1から僅かに遅延した受信時間T2の時間差より下方反射物までの段差距離を検出する距離検出機能33とその段差距離に応じたPWM信号を出力するPWM信号出力機能34を有した制御部3と、PWM信号を報知出力ドライバ41にて増幅し報知素子42を駆動する報知出力部4と、超音波信号送受信部と制御部と報知出力部に電力を供給するためのバッテリーにて構成する。【選択図】図1
