To provide a storage box in which a board-shaped item can be packaged using a recycled paper as a material.

The one-side corrugated fitting board-shaped storage box can be formed by a method, wherein an inner frame board 7 is folded into a U-shape to form divided panels and a corrugated surface is formed on each inner surface of the panels. A right angle is formed between adjoining inner surfaces, and the board 7, folded in a U-shape, is put into a vessel 3. After an item 4 to be packaged is put into the folded frame board 7, a cover 5 is placed on the board 7 to form a storage box. Laminated bodies are bonded to the outer peripheries of the box to increase the buffering performance of the box.