To provide a disposable diaper which closes an opening end of a pocket for suppressing entry of excrement into a pocket, by a sheet element forming a pocket, and a production method thereof.SOLUTION: An exterior sheet body 61 formed by sandwiching elastic members 15FU, 15FD, 15RU, 15RD by first and second sheet materials, is separated into a first exterior sheet body 62 and a second exterior sheet body 63, positions of the first and second exterior sheet bodies 62, 63 are changed to positions in which, fixing parts 58a (third region 56) of the exterior sheet bodies are separated, from positions in which the fixing parts of the exterior sheet bodies are close. An end part region of an absorbent body is adhered to the first and second exterior sheet bodies 62, 63, and the third region 56 is folded to a fourth region 57, then the end part region is covered with the third region 56, the surrounding of the end part region is adhered to the fourth region 57, then the fixing parts 58a are positioned on the opening end of the pocket.SELECTED DRAWING: Figure 5【課題】ポケットを構成するシート要素によって、ポケットの開口端を塞いで排泄物がポケット内に流入しづらくなることを抑制可能とした使い捨ておむつおよび使い捨ておむつの製造方法を提供する。【解決手段】弾性部材１５ＦＵ，１５ＦＤ，１５ＲＵ，１５ＲＤを第１シート材と第２シート材で挟み込んだ外装シート体６１を第１外装シート体６２および第２外装シート体６３とに分離し、第１外装シート体６２および第２外装シート体６３の位置を、互いに固定部５８ａ(第３領域５６)が近い状態から互いに離れた状態に変更し、第１外装シート体６２および第２外装シート体６３に吸収性本体の端部領域を接着し、第４領域５７に対して第３領域５６を折り返して、端部領域を第３領域５６で覆い、端部領域の周囲を第４領域５７と接着し、固定部５８ａをポケットの開口端に位置させる。【選択図】図５
