A cabinet structure for electric switchboards, said cabinet having a first rear wall, a second and a third wall respectively superior and inferior, a fourth and a fifth sidewall and a sixth front wall, said walls defining an internal volume able to contain one or more electric devices, said cabinet structure including: - a first sub-structure with substantially rectangular shape, at least two edges (11, 12, 13, 14) of such first sub-structure being folded to form proper coupling profiles, coupling means being furthermore placed in correspondence with the corners of such first sub-structure; - a second and a third sub-structures (20, 30), respectively superior and inferior, each of said second and third sub-structures including one first flat wall (21, 31) with substantially rectangular shape, at least two edges (22, 23, 24, 32, 33, 34) of said first flat wall being folded to form proper coupling profiles; - a fourth and a fifth lateral sub-structures (40, 50), each of such fourth and fifth sub-structures including a second flat wall (41, 51) of substantially rectangular shape, at least one edge (43,53) of said second flat wall (41,51) being folded to form a proper coupling profile, coupling means being placed in correspondence with the ends of such at least a folded edge (43,53), each of said fourth and fifth lateral sub-structures including first link means (42, 52) properly placed on them; - a sixth front sub-structure of substantially rectangular shape including second link means which can be coupled with such first link means (42,52) wherein said first, second, third, fourth and fifth sub-structures are directly coupled one to another; characterised in that - the two lateral edges (11, 12) of said first sub-structure are folded to the interior building a profile with three flat surfaces (110, 111, 112), the first and second (110, 111) of said flat surfaces defining a volume able to contain said coupling means, the second and the third (111, 112) of said flat surfaces defining the coupling profile of said first sub-structure with said fourth and fifth lateral sub-structures (40, 50), said first and third flat surface (110, 112) being parallel one to another and perpendicular to said second flat surface and to a lying plane of said first substructure; - at least a portion of each lateral edge (22,23,24,32,33,34) of said first wall is folded to the interior forming a profile with three flat surfaces (322,323,331,332,333), the first and the second (331, 332) of said flat surfaces defining a volume able to contain said coupling means, the second and third (332, 333) of said flat surfaces defining the coupling profile of said second and third sub-structures with said fourth and fifth lateral sub-structures (40, 50), said first and third flat surface (331, 333) being parallel one to another and perpendicular to said second flat surface and to a lying plane of said first flat wall. - a first sub-structure with substantially rectangular shape, at least two edges (11, 12, 13, 14) of such first sub-structure being folded to form proper coupling profiles, coupling means being furthermore placed in correspondence with the corners of such first sub-structure; - a second and a third sub-structures (20, 30), respectively superior and inferior, each of said second and third sub-structures including one first flat wall (21, 31) with substantially rectangular shape, at least two edges (22, 23, 24, 32, 33, 34) of said first flat wall being folded to form proper coupling profiles; - a fourth and a fifth lateral sub-structures (40, 50), each of such fourth and fifth sub-structures including a second flat wall (41, 51) of substantially rectangular shape, at least one edge (43,53) of said second flat wall (41,51) being folded to form a proper coupling profile, coupling means being placed in correspondence with the ends of such at least a folded edge (43,53), each of said fourth and fifth lateral sub-structures including first link means (42, 52) properly placed on them; - a sixth front sub-structure of substantially rectangular shape including second link means which can be coupled with such first link means (42,52) wherein said first, second, third, fourth and fifth sub-structures are directly coupled one to another; - the two lateral edges (11, 12) of said first sub-structure are folded to the interior building a profile with three flat surfaces (110, 111, 112), the first and second (110, 111) of said flat surfaces defining a volume able to contain said coupling means, the second and the third (111, 112) of said flat surfaces defining the coupling profile of said first sub-structure with said fourth and fifth lateral sub-structures (40, 50), said first and third flat surface (110, 112) being parallel one to another and perpendicular to said second flat surface and to a lying plane of said first substructure; - at least a portion of each lateral edge (22,23,24,32,33,34) of said first wall is folded to the interior forming a profile with three flat surfaces (322,323,331,332,333), the first and the second (331, 332) of said flat surfaces defining a volume able to contain said coupling means, the second and third (332, 333) of said flat surfaces defining the coupling profile of said second and third sub-structures with said fourth and fifth lateral sub-structures (40, 50), said first and third flat surface (331, 333) being parallel one to another and perpendicular to said second flat surface and to a lying plane of said first flat wall.