The diffusive body lets first light enter and emits scattered light, wherein a scattering layer and a transmission layer, the diffusive body has a light incidence surface that lets the first light enter and a main surface where a first light emission surface emitting the scattered light is formed, the light incidence surface is formed at an end face forming a first end part of the main surface, the diffusive body functions as a light guide path that makes the entered first light move to and fro between the scattering layer and the transmission layer, the scattering layer includes an optical medium on a nanometer order and generates the scattered light by having the first light scattered by the optical medium on the nanometer order, and a correlated color temperature of the scattered light is higher than the correlated color temperature of the first light.