Surface light source

The invention provides a surface light source which can be easily installed on an installed surface and has less limitation on installation places than before. The surface light source has a light-emitting surface and a rear surface, is mounted on the mounted surface such that the rear surface is parallel to the mounted surface, and has an exterior portion having one side in plan view of the light-emitting surface, a plurality of light-emitting panels, and a power supply wiring connected to the plurality of light-emitting panels within the exterior portion. And the outer cover part extends outwards from the end surface to which one side of the outer cover part belongs. 本发明提供一种能够容易地安装于已设的被安装面，且设置场所的限制比以往少的面光源。上述面光源构成为：具有发光面和背面，并以背面相对于被安装面平行的方式安装于被安装面，具有外装部、多个发光面板以及供电布线，外装部在俯视观察发光面时具有一边，供电布线在外装部内与多个发光面板连接，并从外装部的一边所属的端面向外部延伸设置。