This method comprises: conveying, in the conveyance direction, a composite sheet that is formed by inserting an elastic member between a thermoplastic first continuous sheet and a thermoplastic second continuous sheet and fixing the elastic member with a thermoplastic adhesive and forming, in the composite sheet, a high-stretchability region and a low-stretchability region in a row in the conveyance direction by cutting the elastic member at one or more locations in the conveyance direction in a region corresponding to the low-stretchability region. During such forming, after a heating member heats at least one of a cutter rotary body and an anvil rotary body, which rotate such that the respective outer peripheral surfaces thereof are mutually opposed, so that the temperature of said at least one rotary body remains lower than the melting point of the adhesive, the anvil rotary body and a cutter blade on the outer peripheral surface of the cutter rotary body compressively clamp the composite sheet when the composite sheet passes between the cutter rotary body and the anvil rotary body along the conveyance direction, such that a crimped part between the first continuous sheet and the second continuous sheet is formed at the position where the composite sheet is compressively clamped, while the elastic member is cut.La présente invention concerne un procédé qui comprend : lacheminement, dans la direction de transport, dune feuille composite qui est formée par linsertion dun élément élastique entre une première feuille thermoplastique continue et une seconde feuille thermoplastique continue et la fixation de lélément élastique avec un adhésif thermoplastique et la formation, dans la feuille composite, dune région présentant une grande extensibilité et dune région présentant une faible extensibilité dans une rangée dans la direction de transport en découpant lélément élastique au niveau dun ou de plusieurs emplacements dans la direction de transport dans une région corr
