A reflector for a vehicle headlight is described, capable of illuminating the surrounding space according to a predetermined light distribution. The reflector is formed of a plurality of sectors capable of reflecting the light beam emitted by a light source of the headlight and directing it into predetermined regions of said light distribution. The major part of the sectors of the reflector is delimited at least in part by an edge in which the divergence value of the light beam reflected at said edge portions is constant. The sectors delimited by edge portions having lower values of the angle of spread are arranged to direct the light beam reflected thereby into the regions of the light distribution having a higher spatial gradient of illuminance.