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特許 権利維持 A case that makes visible the surface of an object kept therein through one of its sides is provided. The case, which comprises a top (1), a bottom (2) and at least one side (101, 201, 202), is a case for keeping an object therein, and at least one of the sides (101, 201, 202) has a transparent member which performs at least one of the functions of converging, diverging, or bending the path of, the light reflected from the object inside the case. As the transparent member, a convex lens, a concave lens or a prism can be used. Where a lens is to be used, particularly a non-central part of the lens can be suitably utilized.