A diaper (1) of the present invention includes an absorbent member (23), and an absorbent assembly (2) having a topsheet (21 and an outer layer composite sheet (22. The absorbent assembly (2) has a side sheet (24) disposed and fixed at each side part thereof through fixed parts (27). The side sheet (24) is formed from one sheet, an edge (23I) of an inward end part thereof is turned up to a position of the fixed part (27), and elastic members (25) are disposed in the vicinity of an apex part (24T1) of the turnup. In the side sheet (24), an edge (24I) of an outward end part thereof is turned up to a position of the fixed part (27), and forming a space (S) from an apex part (24T2) of the turnup, elastic members (26) are disposed and fixed. In the side sheet (24), the turned up sheets in an area (24Z) except for an area (25T) where the elastic members (25) are disposed and an area (26T) where the elastic members (26) are disposed are joined through a fusion part (28) to integrate them.本創作之尿布(1)包括包含吸收體(23)、表面片材(21)及外層複合片材(22)之吸收性本體(2)。吸收性本體(2)於其兩側部具有經由固定部(27)而配設固定之側部片材(24)。側部片材(24)包含一片片材,內側端部之邊緣(24I)反折至固定部(27)之位置,於反折之頂部(24T1)附近配設固定有彈性構件(25)。又,側部片材(24)中,外側端部之邊緣(24I)反折至固定部(27)之位置,自反折之頂部(24T2)隔開間隔(S)而配設固定有彈性構件(26)。又,側部片材(24)中,除配置有彈性構件(25)之區域(25T)及配置有彈性構件(26)之區域(26T)以外的區域(24Z)中之經反折之片材間藉由熔合部(28)接合而一體化。1‧‧‧拋棄式尿布3‧‧‧伸縮性側片3a‧‧‧前端部3b‧‧‧基端部3d、3u‧‧‧上下邊緣4‧‧‧黏扣帶24‧‧‧側部片材24I‧‧‧內側端部之邊緣24O‧‧‧外側端部之邊緣24T1‧‧‧反折之頂部24T2‧‧‧反折之頂部24Z‧‧‧區域28‧‧‧熔合部30‧‧‧中間區域33‧‧‧彈性構件35‧‧‧本體側接著劑層36‧‧‧前端側接著劑層37‧‧‧中間接著劑層38‧‧‧非接著區域41‧‧‧固定部250T‧‧‧立體褶皺彈性構件之延伸區域260T‧‧‧腿部褶皺彈性構件之延伸區域X‧‧‧方向Y‧‧‧方向
