Provided is a sunshine shielding device that enables reduction in thickness of a shielding material for reflecting heat rays. According to the present invention, a horizontal blind is provided with: a head box through which a lifting cord is suspended; and a slat 12 that moves vertically in accordance with the vertical movement of the lifting cord. The slat 12 is provided with: a base material 31 equipped with a convex surface 31a and a concave surface 31b; an infrared reflecting layer 33 for reflecting infrared rays on the concave surface 31b of the base material 31; and a solar light reflecting layer 32 for reflecting solar light on the convex surface 31a. The infrared reflecting layer 33 is formed by thermal transfer.
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