An absorber of a disposable diaper includes a first region extending from an end at the side of the rear waistline region of the absorber towards a side of the crotch region, and a second region arranged adjacent to the first region at the side of the crotch region from the first region, and having a lower bending rigidity than the first region. The end at the side of the rear waistline region of the leg stretch unit and the end at the side of the rear waistline region of the contracted unit in the leg side stretch unit are arranged at the side of the crotch region from the end at the side of the rear waistline region of the first region, and are also arranged at the side of the rear waistline region from the end at the side of the crotch region of the first region.
