To provide a disposable diaper which is excellent in air permeability in a crotch part.SOLUTION: A disposable diaper 1 includes an exterior member 2 which has a front side waist part P, a rear side waist part Q, and a crotch part R positioned between them and is formed into an underpants shape, and an absorbent body 7 which is provided in the crotch part R of the exterior member 2 and has a top sheet, a back sheet, and an absorber disposed between them. The exterior member 2 includes an inner sheet 5 and an outer sheet 6 respectively having the front side waist part P, the rear side waist part Q, and the crotch part R. The inner sheet 5 and/or the outer sheet 6 is constituted of a heterogeneous sheet in which the basis weight of the crotch part R is formed to be smaller than the basis weight of the front side waist part P and the basis weight of the rear side waist part Q.SELECTED DRAWING: Figure 1【課題】股部での通気性に優れた使い捨ておむつを提供する。【解決手段】前側胴部Ｐと後側胴部Ｑとこれらの間に位置する股部Ｒを有し、パンツ形状に形成された外装部材２と、外装部材２の股部Ｒに設けられ、トップシートとバックシートとこれらの間に配された吸収体を有する吸収性本体７とを有する使い捨ておむつ１であって、外装部材２は、それぞれ前側胴部Ｐと後側胴部Ｑと股部Ｒを有する内側シート５と外側シート６とを有し、内側シート５および／または外側シート６は、股部Ｒの目付が前側胴部Ｐの目付と後側胴部Ｑの目付よりも小さく形成された不均質シートから構成されている。【選択図】図１
