A joining structure in a laminate includes metal layers as well as at least one adhesive layer which is enclosed by the metal layers, which metal layers each include separate metal-layer parts having a pair of overlapping edges, which pairs of edges are offset with respect to each other and together define a joining region. The laminate includes a section which is of standard construction and a section which contains an additional, internal reinforcing metal layer, the reinforcing metal layer including two reinforcing metal-layers parts with a pair of overlapping edges, the pair of edges being located outside the joining region.