PURPOSE: To widen the field of vision by exactly removing water in the corners of the wind screen glass by using a system in which a wiper made of a transparent material is moved horizontally.

CONSTITUTION: When a disc 2 is turned by a motor 1 and one of the upper and lower guide rails is contacted with the disc 2, the motor 1 moves sideways along a supporting rail 3 by a slide roller 32. When the motor 1 comes into contact with a stopper 15 at the end of the guide rail 4, the lever 5 turns to switch the guide rail 4 which contacts with the disc 2. Accordingly, the motor 1 moves in the opposite direction, and when the motor 1 comes into contact with the stopper 15 on the opposite side, the guide rail 4 which contacts with the disc 2 is likewise switched. In this way, the motor 1 moves reciprocally in the horizontal direction. The wiper blade 8 made of a transparent material, therefore, moves reciprocally in the horizontal direction because of being connected with the motor 1.