Patent ID: 8579486

Claim:
A vehicular headlamp apparatus comprising: a lamp body that has an opening section at a vehicle front side; a translucent cover that is attached so as to cover the opening section; and a lamp unit that is provided in a lamp chamber defined by the lamp body and the translucent cover, and that includes a light source mounting portion, a semiconductor light-emitting element that serves as a light source and a reflector that has a reflective surface reflecting light, irradiated from the semiconductor light-emitting element, toward a vehicle front, wherein the translucent cover has a slanted portion that is slanted with respect to a plane perpendicular to an optical axis of the lamp unit, the optical axis extending in a vehicle longitudinal direction, the semiconductor light-emitting element is mounted on the light source mounting portion so that an irradiation axis of the semiconductor light-emitting element intersects with the optical axis of the lamp unit, one end of the reflective surface is located on a vehicle rear side with respect to the semiconductor light-emitting element, the other end of the reflective surface protrudes toward the vehicle front from a vehicle front side end of the light source mounting portion, the reflective surface has a portion that protrudes toward the vehicle front from the vehicle front side end of the light source mounting portion to face the slanted portion, a first area, a second area that is located adjacent to the first area and a third area are set on the reflective surface, the first area includes a portion that intersects with a plane that includes the optical axis and the irradiation axis, light reflected by the first area forms a horizontal cut-off line within a light distribution pattern, light reflected by the second area forms an oblique cut-off line within the light distribution pattern, and light reflected by the third area forms a diffusion portion within the light distribution pattern; wherein the light distribution pattern is a low beam light distribution pattern; only the first area forms the horizontal cut-off line, and only the second area forms the oblique cut-off line.