Abstract: Device for seamless attachment of buttons for use on buttons provided with conventional holes, comprising a base element to be placed under the button between the button itself and cloth, wherein such a base element comprises through holes intended to at least partially coincide with the button holes, and wherein said through holes are internally provided with retaining means, preferably in the form of annular flats or projecting ridges, as well as fastening means, preferably in the form of rivet-like elements to be inserted on one side in the button holes to downwardly project into said base element, and on the other side to be inserted in the cloth for similarly engaging said base element, the engagement from one to the other side being carried out by means of the projections provided on the shank of said rivet-like elements hooking on said annular flats or projecting ridges provided internally of the base element holes.