A disposable diaper, comprising: a front waistline region; a rear waistline region; a crotch region positioned between the front waistline region and the rear waistline region; an absorber running across the crotch region and extending in the front waistline region and the rear waistline region; a pair of fastening tapes extending from the rear waistline region to both outer sides in the product widthwise direction; a target unit arranged at least partially in an absorber-arranged region in which the absorber is arranged, in the front waistline region, and where each of the pair of the fastening tapes is secured; a product longitudinal direction from the front waistline region towards the rear waistline region; a product widthwise direction that is perpendicular to the product longitudinal direction; a pair of leg hole openings being formed; and a pair of leg stretch units formed around the leg hole openings which can expand and contract in at least the product longitudinal direction, characterised in that: the absorber includes a first region extending from an end of the absorber at the side of the front waistline region towards the 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, and a boundary between the first region and the second region is arranged at the side of the front waistline region from the end of the leg stretch units at the side of the front waistline region, and is arranged at the side of the crotch region from the end of the target unit at the side of the crotch region. a front waistline region; a rear waistline region; a crotch region positioned between the front waistline region and the rear waistline region; an absorber running across the crotch region and extending in the front waistline region and the rear waistline region; a pair of fastening tapes extending from the rear waistline region to both outer sides in the product widthwise direction; a target unit arranged at least partially in an absorber-arranged region in which the absorber is arranged, in the front waistline region, and where each of the pair of the fastening tapes is secured; a product longitudinal direction from the front waistline region towards the rear waistline region; a product widthwise direction that is perpendicular to the product longitudinal direction; a pair of leg hole openings being formed; and a pair of leg stretch units formed around the leg hole openings which can expand and contract in at least the product longitudinal direction, characterised in that: the absorber includes a first region extending from an end of the absorber at the side of the front waistline region towards the 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, and a boundary between the first region and the second region is arranged at the side of the front waistline region from the end of the leg stretch units at the side of the front waistline region, and is arranged at the side of the crotch region from the end of the target unit at the side of the crotch region.