Provided is a disposable diaper that allows excreted urine to smoothly move to an absorber and allows a user to wear the product in a state in which it is flexibly fitted to the users body. A disposable diaper comprises a top sheet, a back sheet, an absorber, and a hydrophilic and liquid-permeable absorptive and diffusive sheet interposed between the top sheet and the absorber, in which the top sheet has ridges and furrows, the ridges having a higher weight per unit area than the furrows the absorptive and diffusive sheet is provided on a part of a region in a surface direction of the absorber and when a front-back direction length of the absorber is L0, in the disposable diaper for a male, a front end of the absorptive and diffusive sheet is in a position of 0.0L0 to 0.10L0 from the front end of the absorber and a rear end of the absorptive and diffusive sheet is in a position of 0.50L0 to 0.85L0 from the front end of the absorber, whereas, in the disposable diaper for a female, the front end of the absorptive and diffusive sheet is in a position of 0.2L0 to 0.35L0 from the front end of the absorber and the rear end of the absorptive and diffusive sheet is in a position of 0.7L0 to 1.0L0 from the front end of the absorber.本發明提供一種,可使被排泄的尿順暢地往吸收體移行,且可在產品相對於身體柔軟地貼合的狀態下進行安裝的用後即棄式紙尿布。具備有:頂面薄片;背面薄片;吸收體;以及設在頂面薄片與吸收體之間的親水性且液透過性的吸收擴散薄片之用後即棄式紙尿布,其特徵為:頂面薄片具有脊部與溝部,脊部的基重比溝部的基重更高,吸收擴散薄片設在吸收體的面方向的區域的一部的區域,將吸收體的前後方向長度設為L0時,男子用是吸收擴散薄片的前端位在從吸收體的前端起的0.0L0~0.10L0的位置,吸收擴散薄片的後端是位在從吸收體的前端起的0.50L0~0.85L0的位置,女子用是吸收擴散薄片的前端是位在從吸收體的前端起的0.2L0~0.35L0的位置,吸收擴散薄片的後端是位在從吸收體的前端起的0.7L0~1.0L0的位置。1‧‧‧用後即棄式紙尿布12‧‧‧前腰圍區域14‧‧‧胯下區域16‧‧‧後腰圍區域30‧‧‧翼部34‧‧‧防漏壁50‧‧‧吸收體54‧‧‧吸收體的前端60‧‧‧頂面薄片70、80‧‧‧伸縮構件71‧‧‧前端90‧‧‧吸收擴散薄片91‧‧‧吸收擴散薄片的前端92‧‧‧吸收擴散薄片的後端150‧‧‧扣具用目標帶片160‧‧‧扣具用帶片
