Abstract: On a side face of a corner bracket are formed a common insertion hole for a bolt, a stepped portion having a contact face and a contact edge which come to contact with a side wall of a strut and a side board of a shelf board, a strut projected portion engageable with an engaging hole defined in the side wall of the strut, and a board projected portion engageable with an engaging hole defined in the side board of the shelf board. The stepped portions are formed so as to extend entirely over a lower portion of the side face and to project outward. The side face of the corner bracket extends outside a line connecting between the strut projected portion and the board connecting portion formed thereon. Accordingly, the corner bracket is capable of reinforcing effectively a joint portion of the shelf board and the strut in a simple construction, and of preventing effectively an undesirable shaking of this joint portion.