A headlight for a vehicle, the headlight comprising: a housing of a semi-spherical shape; headlight light sources (20, 21); and auxiliary light sources, with a reflector of a generally semi-spherical shape that reflects irradiation light of the headlight light sources (20, 21) toward vehicle body front when the headlight is installed to the vehicle, being stored inside the housing, wherein all of the headlight light sources (20, 21) and the auxiliary light sources are formed of LEDs, a base plate that mounts the headlight light sources (20, 21) is disposed generally horizontally in front of the reflector, the auxiliary light sources are disposed on a front end surface on the vehicle body front side of the base plate, when the headlight is installed to the vehicle,, the headlight comprising a lens that covers an opening on the vehicle body front side of the reflector, when the headlight is installed to the vehicle, and allows irradiation light of the headlight light sources (20, 21) and the auxiliary light sources to permeate therethrough, light guide members that guide irradiation light of the auxiliary light sources to an optional direction are arranged at a position between the auxiliary light sources and the lens, characterized in that a plurality of the auxiliary light sources are disposed so as to be arrayed laterally in a row on an end surface of the base plate, that the light guide members are long members having a rectangular cross section arranged corresponding to the respective auxiliary light sources and are disposed in an orthogonal direction with respect to the base plate, and that notches that reflect an irradiation light of the auxiliary light sources to the longitudinal direction of the light guide members are formed in the light guide members on the vehicle body front side of positions corresponding to the auxiliary light sources, when the headlight is installed to the vehicle. a housing of a semi-spherical shape; headlight light sources (20, 21); and auxiliary light sources, with a reflector of a generally semi-spherical shape that reflects irradiation light of the headlight light sources (20, 21) toward vehicle body front when the headlight is installed to the vehicle, being stored inside the housing, wherein all of the headlight light sources (20, 21) and the auxiliary light sources are formed of LEDs, a base plate that mounts the headlight light sources (20, 21) is disposed generally horizontally in front of the reflector, the auxiliary light sources are disposed on a front end surface on the vehicle body front side of the base plate, when the headlight is installed to the vehicle,, the headlight comprising a lens that covers an opening on the vehicle body front side of the reflector, when the headlight is installed to the vehicle, and allows irradiation light of the headlight light sources (20, 21) and the auxiliary light sources to permeate therethrough, light guide members that guide irradiation light of the auxiliary light sources to an optional direction are arranged at a position between the auxiliary light sources and the lens, that a plurality of the auxiliary light sources are disposed so as to be arrayed laterally in a row on an end surface of the base plate, that the light guide members are long members having a rectangular cross section arranged corresponding to the respective auxiliary light sources and are disposed in an orthogonal direction with respect to the base plate, and that notches that reflect an irradiation light of the auxiliary light sources to the longitudinal direction of the light guide members are formed in the light guide members on the vehicle body front side of positions corresponding to the auxiliary light sources, when the headlight is installed to the vehicle.