PROBLEM TO BE SOLVED: To easily provide a resin composition which emits near-infrared fluorescence and suppresses reduction in fluorescence intensity due to irradiation with radiation, and a molded body obtained by molding the resin composition.SOLUTION: A resin composition contains a near-infrared fluorescent dye, and the attenuation factor of absorbance in the maximum absorption wavelength due to irradiation with radiation of 25 kGy is 50% or less. A molded body is obtained by molding the resin composition. The molded body is subjected to a radiation sterilization treatment.