Patent ID: 8465189

Claim:
A vehicular headlamp, wherein a light source unit for light distribution formation is accommodated inside a lamp chamber defined by a lamp body and a front cover, the vehicular headlamp comprising: a metal heat transfer member that serves as a light source unit structural member; a light-emitting element that serves as a light source; blowing means for cooling the light-emitting element provided inside the lamp chamber; and a lighting circuit that controls lighting of the light-emitting element, wherein the light-emitting element, the blowing means, and the lighting circuit are each attached to the metal heat transfer member, wherein the lighting circuit is formed from a circuit board mounted with a circuit element, wherein a ventilation passage for air blown from the blowing means is formed between the circuit board and the metal heat transfer member, wherein the ventilation passage is disposed apart from the metal heat transfer member, and wherein the vehicular headlamp further comprises: a heat radiation fin formed in an area directly opposite the blowing means in a vicinity of an entrance to the ventilation passage on the metal heat transfer member, and wherein the heat radiation fin is generally orthogonal to the ventilation passage and extends in a right-left direction, and another heat radiation fin formed on a back surface side of the heat transfer member that is directly opposite the lighting circuit unit.