Abstract: In a sun visor for motor vehicles comprising a mirror and a slider made of a plastic material which serves to cover the mirror and which is guided in guide rails of a holder consisting of a plastic material, there is formed at at least one of the two edge zones of the slider at least one elastic tongue which rests in a biased state against the guide rail accommodating this edge zone and which forms an elastic detent projection which at least in the one end position of the slider cooperates in a frictionally connected manner with a detent provided on the guide rail. A shaped spring inserted in a longitudinal slot of the slider in the edge surface thereof resulting from its thickness may be provided instead of the tongue.