An electronic device storage case for use in storing a substrate therein, includes a hollow box-shaped case body. The case body includes an open surface with an opening, a bottom surface opposite to the opening and a sidewall extending upright from the peripheral edge of the bottom surface, wherein the sidewall of the case body including a plurality of deformable ribs each having a slant surface inclined inwards toward the bottom surface, and wherein the substrate is introduced into the case body through the opening and slidingly moves along the slant surface of each of the deformable ribs to make pressure contact with the slant surface.