Patent ID: 8376597

Claim:
A vehicular lamp comprising: a lamp outer case formed by a cover and a lamp housing; a light source disposed inside the lamp outer case; and a light guide that guides light emitted from the light source, wherein the light guide is shaped as a column, wherein the light guide comprises: a first extension portion that extends on a horizontal plane side, and a second extension portion that extends on a vertical plane side with respect to a reference line that extends in a direction inclined 45 degrees with respect to the horizontal plane, wherein an outer surface of the light guide comprises: an incident surface to which light emitted from the light source is incident, an internal reflection surface that internally reflects light incident from the incident surface, and a radiation surface that is formed as an outward-convexly curved surface and radiates at least light reflected by the internal reflection surface, and wherein ρ1 is a curvature of the radiation surface in a cross section perpendicular to a direction in which the first extension portion extends, wherein ρ2 is a curvature of the radiation surface in a cross section perpendicular to a direction in which the second extension portion extends, and wherein ρ1 is smaller than ρ2.