Tomonari Takeuchi, Tochigi, Japan.
Assigned to Daio Paper Corporation, Ehime, Japan.

Filed: 1/29/16
Issued: 10/13/20

A disposable diaper having a stretchable region ventrodorsally, the region being stretchable in a width direction, comprising: a front torso region, a rear torso region, and an intermediate region disposed between the front torso region and the rear torso region, wherein leg portions are formed by narrowing the intermediate portion toward a center side in the width direction from inner end points of the torso region in a front-back direction over the intermediate portion, the leg portions reside at parts of a stretchable sheet stretchable in the width direction, the stretchable sheet comprises a laminate of a non-stretchable first sheet layer, a non-stretchable second sheet layer, and an elastic film disposed between the first sheet layer and the second sheet layer, the elastic film being stretchable in the width direction, the first sheet layer being bonded to the second sheet layer at a large number of joints directly or through the elastic film, the joints being arrayed at intervals, the stretchable sheet is contracted by a contraction force of the elastic film and can be stretched by an external force applied in the width direction, and the leg portions are also contracted by the contraction force of the elastic film and can be stretched by the external force applied in the width direction,  wherein the leg portions and regions adjoined to the leg portions have different joint area rates that indicate rates of total areas of the joints contained in a unit area and thereby have different stretching stresses.