PROBLEM TO BE SOLVED: To improve sweat absorption performance, especially, a retention property of sweat.SOLUTION: A disposable diaper is provided with: a liquid-permeable top sheet 30 which forms a body side surface a liquid-impermeable sheet 11 positioned on its reverse surface side an absorber 56 which is placed between the top sheet 30 and the liquid-impermeable sheet 11 and extends to a hip part from a lower abdomen along a center in a width direction via a crotch part and a back side end flap part BEF which is formed by the top sheet 30 and the liquid-impermeable sheet 11 extending to a back side beyond the absorber 56. Between the top sheet 30 and the liquid-impermeable sheet 11 in the back side end flap part BEF, a superabsorbent fiber assembly 80 is provided adjacent to a reverse face of the top sheet 30.
