An absorber 40 of a disposable diaper 10 includes a first region 41 extending from an end 40R, on the side of the rear waistline region of the absorber, towards a side of the crotch region, and a second region 42 arranged adjacent to the first region on the side of the crotch region from the first region, and having a lower bending rigidity than the first region. The end 75R, on the side of the rear waistline region, of the leg stretch unit and the end 84R, on the side of the rear waistline region, of the contracted unit in the leg side stretch unit, are arranged on the side of the crotch region from the end 41R, on the side of the rear waistline region, of the first region, and are also arranged on the side of the rear waistline region from the end 41F, on the side of the crotch region, of the first region.