A disposable diaper (10) includes: an absorbing body (40) having a pair of first folds (FL1) and a pair of second folds (FL2) extending in a front-rear direction and a skin-side sheet. The absorbing body includes a first region (401) located between the pair of first folds and including the widthwise middle of the absorbing body, a pair of second regions (402) located between the second folds, which are located on the inner side of the first folds in the width direction, and the first folds and disposed on the skin-facing side of the first region, and a pair of third regions (403) located on the outer side of the second folds in the width direction and disposed on the skin-facing side of the second regions. The pair of second folds are located at a distance from each other in the width direction. The weight of the absorbing material of the second regions is lower than the weight of the absorbing material of the first region and is lower than the weight of the absorbing material of the third regions.用後即棄式紙尿布(10)係具備:具有朝前後方向延伸的一對的第1折線(FL1)及一對的第2折線(FL2)之吸收體(40)、以及皮膚面薄片。吸收體係具有第1區域(401)、一對的第2區域(402)及一對的第3區域(403),第1區域(401)是位於一對的第1折線間且包含吸收體之寬度方向的中央;一對的第2區域(402),是位於比第1折線更靠寬度方向內側之前述第2折線和前述第1折線間,且分別配置在第1區域的皮膚對向面側;一對的第3區域(403),是位於比第2折線更靠寬度方向的外側,且分別配置在第2區域的皮膚對向面側。一對的第2折線是在寬度方向上分離。第2區域之吸收材料的基重,是比前述第1區域之吸收材料的基重低,且比第3區域之吸收材料的基重低。40‧‧‧吸收體40E‧‧‧外側緣401‧‧‧第1區域402‧‧‧第2區域403‧‧‧第3區域L‧‧‧前後方向W‧‧‧寬度方向FL1‧‧‧第1折線FL2‧‧‧第2折線
