Distance detector for vehicle, has light guide unit which directs laser beam on polygon mirror side while angle adjustment of reflective mirror is performed at the time of monitoring preceding vehicle

摘要

A light guide unit (8) has one end arranged at the back side of a reflective mirror (3) and other end facing a photoreceiving portion (6). The light guide unit directs laser beam on the polygon mirror side while angle adjustment of the reflective mirror is performed at the time of monitoring a preceding vehicle.