Provided is a method for producing a disposable underwear-type diaper, by which disposable underwear-type diapers provided with a seamless fastener in a middle portion can be continuously produced. Fasteners (20) folded in two are arranged on one main surface (12a) of a first continuous body (12) so that ends (23, 25) of the fasteners (20) are arranged on the outside of the one main surface (12a). A second continuous body (14) is laid over another main surface (12b) of the first continuous body (12) in a state where one end (23) is bent so as to be laid over the other main surface (12b), and the first continuous body (12) and second continuous body (14) are bonded together to form a composite continuous body (16) to which the one end (23) of the fasteners (20) is fixed. The composite continuous body (16) is cut to form a piece (18) on which the pair of fasteners (20) are arranged only in a first region (18a). The piece (18) is folded in two along an imaginary line (18x) and overlapped, following which the other end (25) of the fasteners (20) is bent and laid over and fixed to a second region (18b).La présente invention concerne un procédé de production dune couche type culotte jetable, par lequel des couches type culottes jetables dotées dune fixation sans couture dans une partie centrale peuvent être produites en continu. Les fixations (20) pliées en deux sont agencées sur une surface principale (12a) dun premier corps continu (12) de telle sorte que les extrémités (23, 25) des fixations (20) sont disposées sur lextérieur de ladite surface principale (12a). Un second corps continu (14) est disposé sur une autre surface principale (12b) du premier corps continu (12) dans un état dans lequel une extrémité (23) est courbée de manière à être placée sur ladite autre surface principale (12b), et le premier corps continu (12) et le second corps continu (14) sont liés lun à lautre pour former un corps continu composite (16) auquel ladite extrémité (23) des fixations (20) e
