To suppress leakage of excrement from a wearing article.SOLUTION: A disposable diaper 10 has a longitudinal direction Y and a lateral direction X and includes a front waist region 13, a rear waist region 14, a crotch region 15 located between the front and rear waist regions 13, 14, and an absorber 66 located at least in the crotch region 15. The absorber 66 has absorber both side portions 66e facing each other in the lateral direction in the crotch region 15, and deformation guide portions 78 extending in the longitudinal direction in the absorber both side portions 66e. An elastic side flap 70 extending in the longitudinal direction is located on the outer side in the lateral direction of the absorber both side portion 66e. A lateral dimension W3 of the side flap 70 is larger than a lateral dimension W4 from an absorber both side edge 66c of the absorber 66 to the side edge of the deformation guide portion 78.SELECTED DRAWING: Figure 4【課題】着用物品から排泄物が漏れるのを抑える。【解決手段】使い捨ておむつ１０は、縦方向Ｙ及び横方向Ｘを有し、前ウエスト域１３と、後ウエスト域１４と、前後ウエスト域１３，１４の間に位置するクロッチ域１５と、少なくともクロッチ域１５に位置する吸収体６６とを含む。吸収体６６は、クロッチ域１５において横方向に互いに対向する吸収体両側部６６ｅと、吸収体両側部６６ｅにおいて縦方向へ延びる変形誘導部７８とを有している。吸収体両側部６６ｅの横方向の外側には、縦方向へ延びる弾性のサイドフラップ７０が位置する。サイドフラップ７０の横方向の寸法Ｗ３は、吸収体６６の吸収体両側縁６６ｃから変形誘導部７８の側縁までの横方向の寸法Ｗ４よりも大きい。【選択図】図４
