To effectively suppress the generation of glare light in a vehicular
headlamp structured so as to form a light
distribution pattern having a horizontal cutoff line, by a catoptric
system provided with a
light source comprising a
semiconductor light emitting element. This vehicular
headlamp is structured to form the light
distribution pattern having the horizontal cutoff line by a
first light source 16 comprising a
light emitting diode, wherein a rectangular light emitting
chip 22 is covered with a hemispherical mold lens 24, and the first catoptric
system 20 provided with a first reflector 18 to reflect light toward the front of a lamp from the
first light source 16. In this case, the
first light source 16 is disposed so as to horizontally turn the light emitting
chip 22 with its one side horizontally placed. The horizontal cutoff line is formed by selectively using light reflected by a reflection region Za located in the almost front direction of the light emitting
chip 22, out of light from the first
light source 16 reflected by the first reflector 18. Thereby, a clear horizontal cutoff line is obtained.