An absorber 40 of a disposable diaper 10 includes a first region extending from an end at the side of the front waistline region of the absorber 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. A boundary between the first region and the second region is arranged at the side of the front waistline region from the end at the side of the front waistline region of the leg stretch units, and is arranged at the side of the crotch region from the end at the side of the crotch region of the target unit.本發明之課題係在於提供既可抑制對穿用者的肌膚之刺激,亦可維持扣帶的固定安裝之用後即棄式紙尿布。用以解決課題之手段為,用後即棄式紙尿布(10)之吸收體(40)具備有:自吸收體的前腰圍區域側的端部朝後腰圍區域側的第1區域;及在比起第1區域更靠近後腰圍區域側,與第1區域鄰接配置,且彎曲剛性較第1區域低的第2區域。第1區域與第2區域之邊界係構成為比起腳伸縮部的前腰圍區域側的端部配置在更靠近前腰圍區域側,且比起目標部的胯下區域側的端部配置在更靠近胯下區域側。10‧‧‧用後即棄式紙尿布20‧‧‧前腰圍區域25‧‧‧胯下區域30‧‧‧後腰圍區域35‧‧‧腳圍開口部40‧‧‧吸收層41‧‧‧第1區域42‧‧‧第2區域70‧‧‧側翼片75‧‧‧腳伸縮部80‧‧‧腳側皺褶81‧‧‧接合部分82‧‧‧自由端部分85‧‧‧腰圍伸縮部90‧‧‧扣帶91‧‧‧基材薄片92‧‧‧鉤薄片95‧‧‧目標部115‧‧‧缺口125‧‧‧缺口200‧‧‧褲襠部200a‧‧‧胯下伸縮部L‧‧‧製品長度方向W‧‧‧製品寬度方向
