To efficiently heat even a reactant with a low wavelength absorption factor from a visible area to a near-infrared area.

A furnace body 10 housing a reactant 12 is provided so that sunlight 7 collected by a light collector 13 is radiated to a peak part. A light receiving part 11 capable of converting the sunlight 7 into thermal energy at high efficiency is provided at the peak of the furnace body 10, so as to constitute a solar furnace device 9. After receiving the sunlight 7 collected by the light collector 13 with the light receiving part 11 and converting it into thermal energy, thermal radiation is performed toward the reactant 12 in the furnace body 10 by the light receiving part 11, so as to apply, to the reactant 12, the electromagnetic waves of thermal radiation in which energy is concentrated in an infrared area shifted to a longer wavelength side than a visible area and a near-infrared area in which energy of the sunlight 7 is concentrated, for heating the reactant 12.

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