A headlamp includes a plurality of first light sources for projecting a high beam, a plurality of second light sources for projecting a low beam, a first light guide, and a second light guide. The first light guide has a plurality of light entry surfaces arranged side by side for receiving light emitted from the first light sources and a first light exit surface. The second light guide has a plurality of light entry surfaces arranged side by side for receiving light emitted from the second light sources and a second light exit surface. At least a first one of the light entry surfaces of either the first light guide or the second light guide has a greater width in the direction in which the light entry surfaces are arranged than at least a second one of the light entry surfaces.