Abstract: A headlight includes multiple semiconductor light sources arranged in a line, and an optical system including an integral-type optical member to form a predetermined light distribution by using light outputted by the multiple semiconductor light sources, wherein the integral-type optical member has an incidence surface portion, a cutoff line formation portion, a reflection surface portion and an exit surface portion, the incidence surface portion, the cutoff line formation portion, the reflection surface portion and the exit surface portion are arranged in order in such a way as to be along an optical path in the optical system, the exit surface portion has a uniform vertical curvature, and a horizontal illumination area is controlled by the reflection surface portion and a vertical illumination area is controlled by the exit surface portion.

Abstract: A headlight includes multiple semiconductor light sources arranged in a line, and an optical system including an integral-type optical member to form a predetermined light distribution by using light outputted by the multiple semiconductor light sources, wherein the integral-type optical member has an incidence surface portion, a cutoff line formation portion, a reflection surface portion and an exit surface portion, the incidence surface portion, the cutoff line formation portion, the reflection surface portion and the exit surface portion are arranged in order in such a way as to be along an optical path in the optical system, the exit surface portion has a uniform vertical curvature, and a horizontal illumination area is controlled by the reflection surface portion and a vertical illumination area is controlled by the exit surface portion.