This disposable diaper (10) is provided with: a skin-surface-side sheet (50) disposed at a wearer-skin-contacting surface side a non-skin-surface-side sheet (60) disposed at a non-skin-contacting surface side an absorbent body (40) a torso-encircling holding section that holds the disposable diaper to the body of the wearer and a leg extending/contracting section (75). The leg extending/contracting section is disposed at the inside in the product widthwise direction or the inside in the product lengthwise direction with respect to the diaper edges configuring the outer periphery of the disposable diaper. A portion of the torso-encircling holding section is disposed at a first region (R1) to the outside in the product lengthwise direction from the leg extending/contracting section and/or a second region (R2) to the outside in the product widthwise direction from the leg extending/contracting section, and a joining region (65) at which the skin-surface-side sheet and the non-skin-surface-side sheet are joined is provided along the diaper edges.用後即棄式紙尿布(10)係具備有:配置在穿用者的肌膚抵接面側之肌膚面側薄片(50);配置在非肌膚抵接面側的非肌膚面側薄片(60);吸收體(40);將用後即棄式紙尿布保持於穿用者的身體之腰圍保持部;及腳伸縮部(75)。腳伸縮部係配置在較構成用後即棄式紙尿布的外周之紙尿布端部更靠近製品長度方向內側或製品寬度方向內側的位置,在較腳伸縮部更靠近製品長度方向外側的第1區域(R1)及較腳伸縮部更靠近前述製品寬度方向外側的第2區域(R2)中的至少一方,配置有腰圍保持部的一部分,且將肌膚面側薄片與非肌膚面側薄片接合之接合區域(65)沿著紙尿布端部連續地設置。10‧‧‧用後即棄式紙尿布10W‧‧‧製品寬度方向端部40‧‧‧吸收層40a‧‧‧吸收性芯材40b‧‧‧芯材繞包層50‧‧‧肌膚面側薄片51‧‧‧頂面薄片52‧‧‧側薄片60‧‧‧非肌膚面側薄片61‧‧‧外裝薄片62‧‧‧背面薄片71‧‧‧彈性構件75‧‧‧腳伸縮部W‧‧‧製品寬度方向
