PROBLEM TO BE SOLVED: To provide a disposable diaper capable of preventing the entrainment of product width direction end parts while appropriately covering buttocks when put on.SOLUTION: In a disposable diaper 1, leg expansion/contraction parts 75, which expand and contract in the product longitudinal direction, are disposed on the product width direction inner side of each of a pair of leg openings. An area between a rear leg opening and a straight line which passes through the center of the product width direction and is parallel to the product longitudinal direction is larger than an area between a front leg opening and a straight line which passes through the center of the product width direction and extends to the product longitudinal direction. A buttocks expansion/contraction part, which expands and contracts in the product longitudinal direction, is disposed across a crotch region and the rear waist region on the product width direction outer side of the leg expansion/contraction parts. The front end part of the buttocks expansion/contraction part is located behind the center of the product longitudinal direction of the leg opening.COPYRIGHT: (C)2014,JPO&INPIT【課題】臀部を適切に覆いながら、装着時に製品幅方向端部の巻き込みを防止す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、一対のレッグ開口部よりも製品幅方向内側に、製品長手方向に伸縮するレッグ伸縮部75が配置される。後側レッグ開口部と、製品幅方向における中心を通り製品長手方向に平行な直線との間の面積は、前側レッグ開口部と、レッグ開口部の製品長手方向中心を通り製品長手方向に延びる直線との間の面積よりも広い。レッグ伸縮部よりも製品幅方向外側には、股下域と前記後胴回り域とに跨って配置され、かつ製品長手方向に伸縮する臀部伸縮部が配置され、臀部伸縮部の前端部は、レッグ開口部の前記製品長手方向の中心よりも後方に位置する。【選択図】図1
