[PROBLEMS] A light-shielding sheet ensuring sufficient light-shielding performance without using a metal sheet of aluminum or the like, a sheet sprayed with metal powder, or a colored resin film producing a toxic gas or detrimental residues during incineration. [MEANS FOR SOLVING PLOBLEMS] The light-shielding sheet is employed entirely or partially as a package for containing a photosensitive substance and characterized in that the transmissivity to light having a wavelength in the range of 200-800 nm is not higher than 6% by forming a white coating layer on both sides of a base sheet principally comprising pulp.