Heat-radiating light source

A heat-radiating light source comprising a heat-radiating layer and a substrate laminated thereon for heating the heat-radiating layer;

• wherein in the heat-radiating layer, there are provided a radiation control portion and a radiating transparent oxide layer, the radiation control portion comprising a metal insulator metal lamination portion including a pair of platinum layers juxtaposed along a lamination direction of the heat-radiating layer and the substrate, and a resonating transparent oxide layer formed of a transparent oxide and disposed between the pair of platinum layers, the radiation control portion and the radiating transparent oxide layer laminated with the radiation control portion and the radiating transparent oxide layer disposed closer to the substrate in this order;
• wherein the resonating transparent oxide layer has a thickness providing a resonance wavelength equal to or smaller than 4 μm;
• and
• the resonating transparent oxide layer is provided between each adjacent pair of three or more platinum layers juxtaposed along the lamination direction of the heat-radiating layer and the substrate so that the radiation control portion has a plurality of the metal insulator metal lamination portions.