STACK CASE AND METHOD OF ASSEMBLING STACK CASE

The stack case includes a main body with a rectangular opening and a lid member covering the opening. A single positioning pin and a protrusion protrude outward of the main body from an edge in the opening of the side portion. The positioning pin inserted into the insertion hole of the lid member supports the lid member rotatably about the axis of the positioning pin. In a state where the positioning pin is inserted into the insertion hole, the placement surface of the lid member is placed on the positioning surface of the protrusion, whereby the lid member is positioned with respect to the opening.