An absorber 40 of a disposable diaper 10 includes a first region 41 arranged at least partially in the crotch region； a second region 42 arranged adjacent to the first region, at an outer side from the first region in the product longitudinal direction, and having a lower bending rigidity than that of the first region； and a third region 43 arranged adjacent to the second region, at an outer side from the second region in the product longitudinal direction, and having a higher bending rigidity than that of the second region. A boundary between the first region and the second region is arranged in the narrow region. A boundary between the second region and the third region is arranged on the side of the crotch region from an end 95R, on the crotch region side, of the waistline retaining unit in the front waistline region. An end, on the front waistline region side, of the third region is arranged on the side of the front waistline region from the end, on the crotch region side, of the waistline retaining unit in the front waistline region.
