To provide a device and a method utilizing the optical energy of the solar light used for object lighting.

Sollar light collected with a condensing body 1 is received with a light receiving part 2 positioned in an optical focal point of the condensing body or in the vicinity of the focal point, and transmitted to a lighting part 5 through a fiber cable 3 connected to the light receiving part 2. In order to emit the light transmitted to the lighting part 5 to the outside from the front of the lighting surface of the lighting part 5, the solar light received within a diffusion layer 6 arranged within the lighting part in which an optical material selected so as to suitably meet the purpose is filled is straight emitted in front in an irregular reflection state.