PURPOSE: To prevent the collision of a cleaner with the wall face by arranging a mirror body observing the front floor face of the cleaner in front of the tip section of the frame of the cleaner.

CONSTITUTION: A mirror body support arm 10 is tiltably fitted on the front face or at the front section on the side face of a frame 1 with a coil-shaped or plate-shaped spring body 11 or a universal joint, and a mirror body 14, by which an operator 0 can observe a floor face 13 in front of a cleaner A, is supported. The operator 0 recognizes the existence of an obstacle on the floor 13 in front of the cleaner A by observing the mirror body 14 during cleaning, if the obstacle exists at the dead zone generated between the cleaner A and the operator 0, the operator 0 can know its interval by observing the mirror body 14, the trouble to confirm the interval is eliminated, and collision can be prevented.