PROBLEM TO BE SOLVED: To provide a disposable pants-type diaper capable of making a trunk-part elastic member less noticeable by forming pleats extending in a diaper longitudinal direction on a waist part as regularly as possible.SOLUTION: The disposable pants-type diaper comprises a trunk-part elastic member 15 extending in a diaper width direction x on a waist part of an outer wrapper member 2. The outer wrapper member 2 includes an inner sheet 7, an outer sheet 9 and, an intermediate sheet 8 disposed therebetween. The outer sheet 9 and the intermediate sheet 8 are mutually joined at the waist part by a plurality of first joining parts 11 that have a shape being long in a diaper longitudinal direction y and are aligned in the diaper width direction x. The trunk-part elastic member 15 is disposed between the inner sheet 7 and the intermediate sheet 8 and joined with the inner sheet 7 and/or the intermediate sheet 8 at an area 14 where the first joining parts 11 of the outer wrapper member 2 are provided.COPYRIGHT: (C)2015,JPO&INPIT【課題】胴周り部におむつ長手方向に延びる襞ができるだけ規則的に形成され、胴部弾性部材を目立たなくさせることができる使い捨てパンツ型おむつを提供する。【解決手段】外装部材2の胴周り部におむつ幅方向xに延在する胴部弾性部材15を有する使い捨てパンツ型おむつであって、外装部材2は、内側シート7と外側シート9とこれらの間に配された中間シート8を有し、外側シート9と中間シート8は、胴周り部において、おむつ長手方向yに長い形状で、おむつ幅方向xに複数並んで設けられた第1接合部11で互いに接合され、胴部弾性部材15は、内側シート7と中間シート8との間に配され、外装部材2の第1接合部11が設けられた領域14で内側シート7および/または中間シート8に接合されている。【選択図】図4