To provide a light-emitting device emitting light by power generated by a solar cell with increased area of a light-emitting portion, with respect to the area of the surface of the device, as seen from external light.

The light emitting device 100 comprises a light-emitting portion 20 emitting light by electrical energy, and a solar cell 10, having two surfaces one of which is a light-receiving surface facing toward external light and the other of which faces toward the light-emitting portion 20, converting the external light incident on the light-receiving surface into electrical energy and allowing the light emitted by the light-emitting portion 20 to pass.