A lighting system capable of reducing a number of components and cost is provided. A back substrate, a lamp body including front support columns that guide and position the back substrate when the back substrate is attached, and a front substrate that is disposed in the lamp body to be stacked on the back substrate and is fixed to tip end portions of the front support columns are included. The front support columns perform guide and positioning of the back substrate, and fixing of the front substrate, and thereby the number of components and cost of the lamp body are reduced, as compared with a case where the guide portions, positioning portions and fixing portions of the back substrate and the front substrate are individually provided respectively.