Abstract: An apparatus includes a light chamber defined by a lamp body and a front cover. The apparatus houses a projection-type light source unit which integrates a reflector, a light source disposed in the vicinity of a first focal point of the reflector, a convex lens disposed in front of the reflector, and an extension reflector. The convex lens is disposed such that light external from the lamp chamber enters the lamp chamber and is reflected out through the convex lens.

Abstract: A headlamp has a light chamber defined by a lamp body and a front cover. The headlamp houses a projection-type light source unit which integrates a reflector, a light source disposed in the vicinity of a first focal point of the reflector, a convex lens disposed in the front of the reflector via a lens holder, and an extension disposed so as to surround the light source unit U. The lens holder is provided with an upper opening portion. The extension extends to the rear of the upper opening portion. During the daytime when the light source is not lit, incoming light enters the interior of the light source unit via the upper opening portion, without being shielded by the extension.