In the present invention, a lens (10) includes an incidence surface (11) having a cylindrical concave shape, and an emission surface (12) having a convex shape with respect to an optical axis (10a). Alight source (20) has a large vertical spread angle and a horizontal spread angle smaller than the vertical spread angle. The light source (20) is disposed at a position along the vertical directionof the lens (10) at the focal length thereof on the incidence surface side. The light source (20) is disposed so that the horizontal direction thereof matches the curvature direction in the cylindrical shape of the lens (10).