To provide a sunlight thermal converting device capable of efficiently converting sunlight into heat.

A light absorption plate 10 is floated on a surface of tin 7. Since the light absorption plate 10 receives the sunlight L, an absorption rate of the sunlight L is high. Since the sunlight L can be efficiently converted into heat by the light absorption plate 10, and the tin 7 is melted by the heat, a prescribed amount of a heat source can be formed there. Since the tin 7 is melted to be a liquid heat source, and any form can be taken according to the shape of the heat-resistant container 6, the tin can be easily utilized as heat. Since the light absorption plate 10 is square, the plurality of light absorption plates 10 can be closely floated on a surface of the tin 7.

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