PROBLEM TO BE SOLVED: To prevent lateral leakage without deteriorating a feeling of wearing. SOLUTION: In a section in a longitudinal direction in which a wing-shaped flap W is formed, a sheet 10 for forming an upright wall is arranged on an outer surface side of a side sheet 7 and separated from an end edge 7a of the side sheet 7 in the width direction. A base end side joint portion 11 for joining the side sheet 7 and the surface sheet 3 is provided at the position, and the upright wall forming sheet 10 and the side sheet 7 are joined at a position on the center side in the width direction from the base end side joint portion 11. While the working side joint portion 12 is provided, a non-joining region 15 in which the upright wall forming sheet 10 extending outward in the width direction from the working side joint portion 12 and the side sheet 7 are not joined is provided. When the wing-shaped flap W is folded back and fixed to the underwear when attached to the standing wall forming sheet 10, the standing wall forming sheet 10 can be fixed in a state of being moved outward in the width direction relative to the side sheet 7. The adhesive layer 13 for holding the upright wall is provided. [Selection diagram] Fig. 4【課題】装着感を悪化させることなく、横漏れが防止できるようにする。【解決手段】ウイング状フラップＷが形成された長手方向の区間において、サイドシート７の外面側に起立壁形成用シート１０を配設し、サイドシート７の端縁７ａより幅方向外側に離隔した位置に、サイドシート７と表面シート３とを接合する基端側接合部１１を設け、基端側接合部１１より幅方向中央側位置に、起立壁形成用シート１０とサイドシート７とを接合する作動側接合部１２を設ける一方で、作動側接合部１２より幅方向外側に延在する起立壁形成用シート１０とサイドシート７とが接合されない非接合領域１５を設ける。起立壁形成用シート１０に、装着時にウイング状フラップＷを折り返して下着に固定する際、起立壁形成用シート１０をサイドシート７に対して相対的に幅方向外側に移動させた状態で固定できるようにした起立壁保持用粘着剤層１３を設ける。【選択図】図４
