A vehicular headlamp which radiates a beam forward in a predetermined low-beam
light distribution pattern using a projection-type lamp unit and with which visibility
to the sides of a vehicle is improved without having a significant effect on the
formation of the low-beam light distribution pattern. A first additional reflector
for reflecting light from a discharge light source of a discharge bulb forward
is disposed below a discharge bulb of the projection-type lamp unit. A second additional
reflector for reflecting reflected light from the first additional reflector to
one side is provided in front of the first additional reflector. An additional
light distribution pattern that partially overlaps a side portion of the low-beam
light distribution pattern is formed, thereby providing improved illumination of
road zones to the sides of the vehicle. Although a lower portion of a reflector
is cut away in order to receive both additional reflectors, this does not significantly
affect formation of the low-beam light distribution pattern.
