Several sheets of sheet-shaped photosensitive material 1 are stacked on a paper tray container 2 prepared by press-forming stencil paper sheet, the photosensitive material 1 stacked on said paper tray container is inserted into a moisture-proof and light-shielding bag 3 made of a photosensitive material packaging material having moisture-proof and light-shielding properties and having an aluminum thin foil layer, and the moisture-proof and light-shielding bag 3 is sealed tight under a reduced pressure vacuum.
