Abstract: A storage box includes a casing and a one-piece frame unit. The casing includes a pair of first upright lateral inner walls opposite to each other, and a substantially flat bottom wall transversely interposed therebetween to define a front open chamber with the inner walls. The frame unit includes a pair of second upright lateral inner walls each having an inner surface and an outer surface defining therebetween a width slightly larger than that of the first inner walls so as to be press fitted in the chamber. A flange portion is formed on a front edge of each of the second upright lateral outer surfaces for abutting against a front edge of each of the first upright lateral inner walls so as to prevent further movement of the frame unit when the frame unit is press fitted into the chamber. A plurality of first parallel ribs are transversely formed on each of the second upright inner surfaces so as to define a plurality of flat article receiving slots in the chamber.