A process for making a disposable diaper 1 wherein a plurality of backsheets destined to face a garment the wearer puts on are successively connected one to another along respective side edges to form a first web 63. The first web 63 is continuously fed in its longitudinal direction. Tape fastener members 67 extending in the longitudinal direction are fed to the respective backsheets being contiguous one to another in the first web 63 so as to straddle respective lines A corresponding to the side edges of the respective backsheets. Each of the tape fastener members 67 has its longitudinally opposite end portions folded in a Z-shape or an inverted Z-shape. Top sections of these Z-shape and inverted Z-shape are coated on respective under surfaces with a first self-adhesive and bottom sections of these Z-shape and inverted Z-shape are coated on respective under surfaces with a second self-adhesive. The tape fastener member 67 is bonded to the first web 63 by means of the second self-adhesive. The first web 63 and the tape fastener member 67 are simultaneously cut along the line A.
