The issue addressed by the present invention is to easily provide: a resin composition with which detection by X-ray radiation, and detection by fluorescence or phosphorescence are possible and a molded article obtained from said resin composition. The present invention is: a resin composition characterized by containing a light-emitting substance and a radiation-opaque substance the resin composition, wherein the light-emitting substance is a near infrared fluorescent material or a phosphorescent material a resin composition wherein the radiation-opaque substance is one of barium sulfate bismuth oxide bismuth subcarbonate, calcium carbonate, aluminum hydrate, tungsten, zinc oxide, zirconium oxide, zirconium, titanium, platinum, bismuth subnitrate, or bismuth and a molded article obtained by processing one of the aforementioned resin compositions.
