A nappy (1) of the invention is provided with a surface sheet (2), a reverse sheet (3), and a pair of fastening tapes (7) on both side parts (10s) at a back part (B) of an absorbent main body (10) comprising an absorbent body (4) positioned between said sheets (2, 3). Between the pair of fastening tapes (7) and between the surface sheet (2) and the reverse sheet (3), a gathered sheet (6) having a plurality of pleats (60) which extend in the width direction (X direction) is provided. The gathered sheet (6) comprises one sheet of non-woven fabric (61) and a plurality of elastic members (62), which are fixed in position in a state of width direction (X direction)-extension and are arranged intermittently in the longitudinal direction (Y direction) on the non-woven fabric (61). The gathered sheet (6) is formed by the contraction of the elastic members (62) and, viewed cross-sectionally, the elastic members (62) are positioned near to the thickness-direction tip end of the pleats (60).本發明之尿布(1)於包含表面片體(2)、背面片體(3)、及配置於該等片體(2、3)間之吸收體(4)之吸收性本體(10)中的背側部(B)的兩側部(10s)具備一對黏扣帶(7)。於一對黏扣帶(7)之間且於表面片體(2)與背面片體(3)之間具備包含於寬度方向(X方向)上延伸之複數條皺褶(60)之褶皺片體(6)。褶皺片體(6)包含1片不織布(61)、及於不織布(61)上於長度方向(Y方向)上間斷性地配置有複數條且於寬度方向(X方向)上以伸長狀態配設並固定之彈性構件(62)。褶皺片體(6)藉由各彈性構件(62)之收縮而形成,且於剖面觀察時各彈性構件(62)係配置為靠近各皺褶(60)之厚度方向前端。1‧‧‧尿布2‧‧‧表面片體3‧‧‧背面片體4‧‧‧吸收體9‧‧‧黏著劑41‧‧‧吸收性芯體42‧‧‧被覆片體60‧‧‧皺褶61‧‧‧不織布62‧‧‧彈性構件64‧‧‧底部
