A stretchable sheet production method characterized by including A, B, and C, below. A: The coating of an adhesive on at least one inside surface of a pair of continuous sheets (22a, 22b). B: The bonding of the pair of continuous sheets (22a, 22b) and a threadlike elastic member (23) and the formation of a continuous body (30) of stretchable sheet, in a state in which the threadlike elastic member (23) extending in the width direction of the continuous sheets is interposed between the pair of continuous sheets (22a, 22b) having the adhesive coated thereon. C: The insertion of a blade tip of a rotating blade (72) that rotates and has the width direction as the axial direction therefor, into a space (711) provided in a holding member (71), and the cutting, along the continuation direction for the continuous sheets (22a, 22b), of a section of the continuous body (30) of the stretchable sheet that does not have the adhesive coated thereon, without the blade tip and the holding member (71) coming in contact, said continuous body (30) of stretchable sheet being held in a stretched state in the width direction by the holding member (71).Cette invention concerne un procédé de production d'une bande étirable caractérisé par les étapes A, B et C suivantes. L'étape A consiste à appliquer un adhésif sur au moins une face intérieure d'une paire de bandes continues (22a, 22b). L'étape B consiste à coller la paire de bandes continues (22a, 22b) et un élément élastique filiforme (23), et à former un corps continu (30) de bande étirable, de manière à ce que l'élément élastique filiforme (23) partant dans le sens de la largeur des bandes continues soit intercalé entre la paire de bandes continues (22a, 22b) comportant la couche adhésive. L'étape C consiste à insérer la pointe d'une lame rotative (72), qui pivote et qui a pour sens axial le sens de la largeur, dans un espace (711) prévu dans un élément de soutien (71), et à inciser, dans le sens d'évolution des bandes continues (22a,
