Disposable underpants type diapers in which a pocket for containing excrementis aligned easily with an external genitalia and an anus are produced continuously.A first web (201) where diaper basic bodies are continuous in their width directionis supplied in the machine direction MD. A second web where sheet-like membersbeing fixed to the inner surface side of an inseam area in order to form pocketsare continuous in their width direction is supplied in the machine directionMD and folded in the cross direction CD, and then the edge portions are bonded locallyat the same pitch as the width of the diaper basic body, thus obtaining a third web(203) having a joint (135). The third web (203) is superimposed on the first web(201) such that the joint (135) is located in the center of the diaper basic bodyin the width direction and then they are bonded on the opposite side edge portionsof the inseam area, thus obtaining a first compound web (301). The first compoundweb (301) is bent in the cross direction CD and the opposite side edge portionsof the inseam area are bonded to each other, an almost semicircular web piece isclipped from between the diaper basic bodies to form a bond area along a cut lineextending in the cross direction CD, and then it is cut at the cut lineto obtainindividual underpants type diapers.
