PURPOSE: To facilitate the scanning in each direction by constituting the distance measurement part of a wind direction control part from an ultrared ray sensor which receives and transmits ultrared ray and a reflecting mirror which is installed onto the front surface of the ultrared ray sensor and turns at a certain speed.

CONSTITUTION: A distance measuring part 6 and an ultrared ray sensor 7 for receiving and transmitting ultrared ray are fixed onto a basic board 5, and a reflecting mirror 9 which has a turning angle sensor and has mirror surfaces on the both sides and is revolved by a motor 8 is installed. Since the ultrared ray beam 10 collides with an article and instantly returns, scanning and measurement can be carried out in each direction, keeping the ultrared ray sensor 7 fixed onto the basic board 5, and the detection of an article and the distance measurement in a certain range can be stabilized.