In a disposable diaper, a leg stretching unit stretchable in a longitudinal direction is disposed at an inside of a widthwise direction than a pair of leg opening units. An area between a backside leg opening unit and a straight line passing through a center in the widthwise direction and parallel to the longitudinal direction is larger than an area between a foreside leg opening unit and a straight line passing through a center of the longitudinal direction of the leg opening unit and extending in the longitudinal direction. A buttocks part stretching unit running across a crotch region and the back waistline region and stretchable in the longitudinal direction is disposed at an outside of the widthwise direction than the leg stretching unit. A front end of the buttocks part stretching unit is positioned more backward than a center of the longitudinal direction of the leg opening unit.

A disposable diaper (10) in this invention is comprising designs (300a, 300b) that are visually recognizable from a non-skin contact surface side S of the disposable diaper (10) is provided in a region spanning a crotch region (25) and extending to a front waistline region (20) and a rear waistline region (30). A method of arranging the design (300b) provided in a region closer to a side of the front waistline region (20) than the crotch stretching unit (200a) is configured to be different from a method of arranging the design (300a) provided in a region closer to a side of the rear waistline region (30) than the crotch stretching unit (200a).

A stretchable structure of an absorbent article includes two sheet layers that extend in a stretchable direction and an orthogonal direction orthogonal to the stretchable direction; and elongated resilient and elastic members that are disposed between the sheet layers at predetermined intervals in the orthogonal direction and extend in the stretchable direction, wherein, the two ends in the stretchable direction of each of the resilient and elastic members comprise fixed ends fixed to the two sheet layers, and the section between the fixed ends comprises a free section unfixed to the two sheet layers, at least one sheet bonding section is disposed in at least one inter-free region defined between the free sections adjacent to each other in the orthogonal direction, the two sheet layers being bonded in the at least one inter-free region, and the two sheet layers in a contracted state conform with each other in a wave pattern in response to contraction of the resilient and elastic members.