A curbstone deflector for protection of the lateral end region of a snow-clearing strip attached to a snowplow clearing blade has a round or polygonally rounded-off wear edge and a recess that surrounds the end region of the snow-clearing strip, which recess has a front support surface supported on the front side of the snow-clearing strip from the front, and a lateral support surface supported on the side edge of the snow-clearing strip from the side, wherein the front support surface can be braced against the front side of the snow-clearing strip via a screw connection. The expanse of the front support surface in the longitudinal direction of the snow-clearing strip is greater by at least 1.2 times, preferably by 1.5 times than the distance between the lateral support surface and the wear edge of the curbstone deflector.