Bearing structure for shelving, comprising: - at least a vertical upright comprising at least a first metal section provided with at least a first longitudinal side and with at least a second longitudinal side, said first longitudinal side and said second longitudinal side being flat, continuous and transverse to each other; - at least a longitudinal cross-piece; - at least an angular bracket to be interposed between said vertical upright and said longitudinal cross-piece and comprising at least a first longitudinal face and at least a second longitudinal face, said first longitudinal face and said second longitudinal face being flat, contiguous and transverse to each other; wherein it comprises first connecting means (16, 17) arranged on said first longitudinal side and said first longitudinal face, and second connecting means (24, 25), arranged on said second longitudinal side and said second longitudinal face, said first connecting means (16, 17) and said second connecting means (24, 25) coupling said angular bracket to said vertical upright; wherein said first connecting means (16, 17) comprise a plurality of first recesses, formed on one of said first longitudinal side and said first longitudinal face, and a plurality of first attachment portions attachable to said first recesses and formed on the other of said first longitudinal side and said first longitudinal face; wherein said first recesses comprise at least one expanded portion and at least one restricted portion, each of said first attachment portions being attachable to at least one of said expanded portion and said restricted portion; characterized by the fact that at least one of said first attachment portions comprises at least a first attachment element attachable to said expanded portion. - at least a vertical upright comprising at least a first metal section provided with at least a first longitudinal side and with at least a second longitudinal side, said first longitudinal side and said second longitudinal side being flat, continuous and transverse to each other; - at least a longitudinal cross-piece; - at least an angular bracket to be interposed between said vertical upright and said longitudinal cross-piece and comprising at least a first longitudinal face and at least a second longitudinal face, said first longitudinal face and said second longitudinal face being flat, contiguous and transverse to each other; wherein it comprises first connecting means (16, 17) arranged on said first longitudinal side and said first longitudinal face, and second connecting means (24, 25), arranged on said second longitudinal side and said second longitudinal face, said first connecting means (16, 17) and said second connecting means (24, 25) coupling said angular bracket to said vertical upright; wherein said first connecting means (16, 17) comprise a plurality of first recesses, formed on one of said first longitudinal side and said first longitudinal face, and a plurality of first attachment portions attachable to said first recesses and formed on the other of said first longitudinal side and said first longitudinal face; wherein said first recesses comprise at least one expanded portion and at least one restricted portion, each of said first attachment portions being attachable to at least one of said expanded portion and said restricted portion; characterized by the fact that at least one of said first attachment portions comprises at least a first attachment element attachable to said expanded portion. wherein it comprises first connecting means (16, 17) arranged on said first longitudinal side and said first longitudinal face, and second connecting means (24, 25), arranged on said second longitudinal side and said second longitudinal face, said first connecting means (16, 17) and said second connecting means (24, 25) coupling said angular bracket to said vertical upright; wherein said first connecting means (16, 17) comprise a plurality of first recesses, formed on one of said first longitudinal side and said first longitudinal face, and a plurality of first attachment portions attachable to said first recesses and formed on the other of said first longitudinal side and said first longitudinal face; wherein said first recesses comprise at least one expanded portion and at least one restricted portion, each of said first attachment portions being attachable to at least one of said expanded portion and said restricted portion; characterized by the fact that at least one of said first attachment portions comprises at least a first attachment element attachable to said expanded portion.