Diffusive body and illumination device

A diffusive body that lets first light enter and emits scattered light, the diffusive body comprising:

• a scattering layer that exerts predetermined scattering power on the first light and a transmission layer that passes through the first light are stacked together;
• 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, wherein
• 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 entered 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.