To provide a vehicular lamp capable of preventing or removing quickly haziness inside the surface of a lens by controlling an air flow inside a lamp chamber.

In the headlight (a vehicular lamp) 1, composed of a bulb that is a light source, a reflector 8 for reflecting the light from the bulb, and an extension 9 covering a gap between the reflector 8 and a housing 2, all accommodated in a lamp chamber 4 demarcated by the housing 2 and a lens 3 covering the opening of the housing, there is provided in projection a rib (a wall) 11 on a back surface of the extension 9, for guiding the air inside the lamp chamber 4 to a space S between the extension 9 and the lens 3.