PROBLEM TO BE SOLVED: To provide a disposable diaper where elastic members constituting leg gathers are arranged around the legs of a wearer thereby to enhance fittability around the legs.SOLUTION: The disposable diaper 1 is provided with: a diaper body 10 having a plurality of elastic members, which are positioned farther to the outside in the width direction than an absorbent body in a stretched state in the longitudinal direction of the absorbent body dorsal side flaps 20 that extend further to the outside in the width direction than the diaper body and joining sections 51 that join the dorsal side flaps 20 and the diaper body. A first elastic member 123a and a first elastic member 124a, which are positioned farthest to the outside in the width direction among the plurality of elastic members, overlap with the joining sections in the thickness direction T of the disposable diaper in a stretched state in the longitudinal state.COPYRIGHT: (C)2013,JPO&INPIT【課題】レッグギャザーを構成する伸縮性部材を着用者の脚周りに沿って配置して、脚周りにおけるフィット性を高めることができる使い捨ておむつを提供する。【解決手段】 使い捨ておむつ1は、吸収体の長手方向に沿って伸長された状態で吸収体よりも幅方向外側に配置された複数の伸縮性部材を有するおむつ本体10と、おむつ本体よりも幅方向外側に延出する背側サイドフラップ20と、背側サイドフラップ20とおむつ本体とを接合する接合部51と、を備える。複数の伸縮性部材のうち最も前記幅方向外側に位置する第1伸縮性部材123a及び第1伸縮性部材124aは、長手方向に沿って伸長された状態で、使い捨ておむつの厚さ方向Tにおいて接合部に重なっている。【選択図】図7