PURPOSE: To facilitate the work and improve the shelf efficiency by supporting shelf plates to a supporter rotatably upward from the horizontal position on a bed plate fixing the shelf plates to the shelf supporter in a stack shelf.
CONSTITUTION: When a storage article is to be mounted, upper shelf plates 5c, 5b, 5a are rotated upward and are hooked to a stopper rod 8, then no obstacle shelf plate is left on the lowest bed plate 4, and the storage article can be mounted from above. When the loading on the bed plate 4 is completed, the shelf plate 5a is rotated downward, and after legs 7 are brought into contact with the bed plate 4 and stabilized, the shelf plate 5a is loaded. Likewise, the shelf plates 5b, 5c are rotated in sequence and are loaded. Accordingly, the work is facilitated and the shelf efficiency can be improved.