DISTANCE MEASURING DEVICE

A distance measuring device (1) measures a distance to an object present in a ranging region by irradiating the ranging region with laser light. The distance measuring device (1) is provided with: a condensing lens (35) for condensing reflected light comprising the laser light that has been reflected from the object; a tubular lens barrel (36) which is disposed downstream of the condensing lens (35), and in which two types of reflecting surfaces (36c, 36d) having different angles of inclination with respect to an optical axis of the condensing lens (35) are formed on an inside surface onto which the reflected light that has been condensed by the condensing lens (35) is incident; and an optical detector (38) which receives the reflected light that has passed through the lens barrel (36). 距离测定装置(1)对测距区域照射激光来测定到测距区域中存在的物体的距离。距离测定装置(1)具备：聚光透镜(35)，将被物体反射的激光的反射光聚光；筒状的镜筒(36)，配置在聚光透镜(35)的后级侧，在由聚光透镜(35)聚光的反射光所入射的内侧面形成相对于聚光透镜(35)的光轴的倾斜角不同的两种反射面(36c、36d)；以及光检测器(38)，接收经由镜筒(36)的所述反射光。