PURPOSE: A robot cleaner brings out multiple rays closely from wide sensor, senses through the returning-rays a tiny thing which is put toward the ray's direction and switches the robot's running direction. CONSTITUTION: The robot cleaner comprises:a handy cleaner(200) jointed with a traveling robot(100); an inlet brush(102) to inlet foreign matters in the cleaning part; a right wheel driving motor (111) and a left wheel driving motor(121) to drive a right wheel(110) and a left wheel(120); a wide sensor(130) installed in front part of the inlet brush(102).
