PURPOSE: To allow an illuminating unit with thin vertical width to be employed to eliminate the need to paint the illuminating unit with the same color as that of a spoiler body by keeping a lamp unit separate from the illuminating unit, and arranging the illuminating unit separately at the rear of the spoiler body.

CONSTITUTION: A lamp unit 25 is assembled to a spoiler body 17 of hollow structure having lower points 22 continuously on the lower face part 21 along the crosswise direction of a car body, and the light of the lamp unit 25 is emitted backward from an illuminating unit 19 located at the rear of the spoiler body 17. In this case, the lamp unit 25 is kept separate from the illuminating unit 19, and the illuminating unit 25 is assembled to the spoiler body 17 at the front side position of the lowest point 22.