A lighting device for a motorcycle includes a first lamp, a second lamp, a first outer proximate portion, and a first inner proximate portion. The first outer proximate portion is provided on one of first and second lenses and extends toward another of the first and second lenses along a surface of said one of the first and second lenses. The first inner proximate portion is provided on said one of the first and second lenses and extends toward said another of the first and second lenses. A first gap is provided between the first outer proximate portion and said another of the first and second lenses. A second gap is provided between the first inner proximate portion and said another of the first and second lenses. The second gap is smaller than the first gap.