To provide a liquid crystal display device that neither increases the space of a solar battery panel 6 nor causes a decrease in luminance.

The liquid crystal display device having a light guide plate which guides light to a liquid crystal display panel has the solar battery panel right opposite at least one end surface of the light guide plate which is not opposed to a light source. Further, the solar battery panel is arranged nearly in parallel along a flank where the light source is not arranged. In a back light unit which has no light guide plate and which has a hollow housing, the solar battery panel is arranged along a flank where no light source is arranged in the housing.