An absorber of a disposable diaper includes a first region arranged partially in the crotch region； a second region arranged adjacent to the first region and having a lower bending rigidity than that of the first region； and a third region arranged adjacent to the second region and having a higher bending rigidity than that of the second region. A boundary between the first and second regions is arranged in a narrow region. A boundary between the second and third regions is arranged at the side of the crotch region from an end at the crotch region side of a waistline retaining unit in the front waistline region. An end at the front waistline region side of the third region is arranged at the side of the front waistline region from the end at the crotch region side of the waistline retaining unit in the front waistline region.
