The purpose of the present invention is to make the overall manufacturing equipment for pant-type and T-type disposable diapers more compact and to produce diapers efficiently by keeping waste of materials to a minimum. The diaper manufacturing method is characterized in that: a base material sheet (8) obtained from a continuous
sheet material (W) and an elastic member (11) is continuously supplied in a feed direction (A); an absorbent body (5) is attached to the base material sheet (W) in the central portion of the width direction; the base material sheet (W) is divided into a pair of
waist-encircling sheet portions (9a, 9b) and a single
crotch covering sheet portion (10) by two dividing lines (18) along the longitudinal direction of the base material sheet; the
crotch covering sheet portion (10) is
cut at a prescribed length to form individual
crotch coverings (6); the crotch coverings (6) are joined one by one alternately to one or the other
waist-encircling sheet portion (9a, 9b); the
waist-encircling sheet portions (9a, 9b) are
cut at an intermediate position between crotch coverings (6) that are adjacent to each other; the crotch sections (3) are folded in two; and the sections near the two ends of the waist-encircling sections (2) are folded inward and each of said ends is fixed to the free end of the crotch section (3).