A wind deflector for reducing noise at a vehicle roof opening has a wind deflector blade (1) which is pivotally mounted by at least one pivot bearing to pivot about a pivot axis C extending crosswise to the direction of travel. The pivot bearing has two partial bearing shafts (6, 7) which are spaced apart axially on a longitudinal edge (8) of the wind deflector blade and are mounted in bearing blocks (12, 13) on the roof which, for axial insertion of the partial shaft (6, 7), are open at their respective axial ends and are closed at the opposite ends (14, 15) for axial supporting of an end of the partial shafts (6, 7). Between the two partial shafts (6, 7) there is a coil spring (16) which is biased at one end on a first spring housing (17) fixed to the roof in the region of a first partial shaft (6) and at the other end on a second spring housing (18, 19) on the wind deflector blade side in the region of the second partial shaft (7).