To provide a disposable diaper capable of reducing leakage by deforming an absorbent core along crotch of a body.SOLUTION: An absorbent core in an inseam area of a disposable diaper (10) is provided with a pair of low basis weight parts (33) extending in a cross direction and arranged with an interval in a width direction, and with a center high rigidity part (71) having higher rigidity than a peripheral area between the pair of low basis weight parts. Assuming that a length in the width direction of the center high rigidity part is A, and that a distance between the center high rigidity part and the low basis weight part is B, A+B×2>；A and B×2<；A are satisfied.SELECTED DRAWING: Figure 2【課題】身体の股間に沿うように吸収コアを変形させ、漏れを低減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(10)の股下域の吸収コアには、前後方向に延び、かつ幅方向に間隔を空けて配置された一対の低坪量部(33)と、一対の低坪量部間において周囲の領域よりも剛性が高い中央高剛性部(71)と、が設けられている。中央高剛性部の幅方向の長さをＡ、中央高剛性部と低坪量部との距離をＢとすると、Ａ＋Ｂ×２＞Ａを満たし、Ｂ×２＜Ａを満たす。【選択図】図２
