The car lighting device (1) is disposed in the interior of a car and is provided with: seat rails (3) that are disposed on the floor surface (5), which supports seats (4) so as to be slidable; rod-shaped light-conducting bodies (100) disposed in the upper surface (21) of the seat rails (3); and moldings (2) that cover the rod-shaped light-conducting bodies (100). The moldings (2) are provided with light-emitting sections (10) on the upper surface (21) and the flanges (23) thereof. The light-emitting sections (10) are disposed in a continuous or discontinuous straight line along the seat rails (3).