To prevent that a translucent cover is illuminated on an unlighted lamp side.

A vehicular headlight 1 includes: two light source groups 3, 4; the translucent cover 5 to cover a front of the light source groups 3, 4; and a belt-like mall 7 fixed to the translucent cover 5. Each headlight is installed at right and left ends of the vehicular front, and set to irradiate light from the light source groups 3, 4 ahead of a vehicle. The translucent cover 5 has a groove part 6 as a covered region covered with the mall 7, and two translucent regions 50, 51 partitioned by the groove part 6 and opposed respectively to the separated light source groups 3, 4. In the groove part 6, a plurality of stages 60 to 62 are formed along a neighboring direction of the two translucent regions 50, 51.