To make size adjustment easy by enlarging the applying range of a waist.

The fastening tapes 10 are loop-shape sheet members having the base materials 20 projecting laterally from both the side parts of a back side, outside face side surfaces and inside face side surfaces of a diaper, and inserting holes between the surfaces, comprises hook materials 21 having hook elements 22 in the inside face side surface of the diaper for inserting the base material 20 and arranged movably along the base material 20, the projections 24 are arranged in the outside face side surface of the diaper in the distal end parts of the base material 20, the openings 25, 26 engaging with the projections 24 are arranged in the base materials 20 and the hook materials 21, the base materials of parts passing through the hook materials 21 are folded back onto the outside face side of the diaper, the projections 24 and the openings 25 or 26 are engaged, thereby the hook materials 21 can be fixed at predetermined positions of the base materials 20.