To provide a lighting device capable of realizing thinness and weight reduction.

The cover integrated lighting device 10 comprises a light source and a light guide plate 12 which introduces the light from the light source from the side end face and emits the light propagating inside from an outgoing face, and the light guide plate 12 serves concurrently as a protection cover. A prism shape which, by reflecting, emits the light propagating inside the light guide plate to the outgoing face side is formed at the outgoing face 12b of the light guide plate 12, and the face 12c on the opposite side to the outgoing face of the light guide plate 12 is formed in a flat face.