A push latch cam is provided so as to be rotatable integrally with a intermittence gear, a cam driving gear for rotating a wiper support member cam rotates in connection with the rotation of the intermittence gear, and in a range in which the intermittence gear is engaged with a planetary gear, so that the intermittence gear can be rotated, a rotation range of the intermittence gear capable of opening and closing a atmosphere opening valve by the push latch mechanism and a rotation range of the intermittence gear in which the wiper is displaced by the rotation of the wiper support member cam are set in non-overlapped positions.