An object of the present invention is to prevent a fixed portion by heat welding on a leak-proof wall from coming into contact with a wearer's skin. An absorbent article (1) includes an absorbent main body (AB), a pair of side flaps (7, 7), and a pair of leak-proof walls (5, 5), and is bonded between the pair of side flaps in the absorbent main body. And an elastic member 11 that can be expanded and contracted in the width direction. Each of the pair of leak-proof walls is adjacent to an upright part 5c in which the outer side in the width direction is a fixed end and the inner side in the width direction is a free end, and one end part in the longitudinal direction of the upright part, And a support portion 5b overlapping in the thickness direction. The support part 5b is located on the inner side in the width direction and is not fixed to the absorbent main body 5SI, and the outer part 5SO is located on the outer side in the width direction and fixed to the absorbent main body with the heat welding part 50. ,including. [Selection] Figure 3【課題】防漏壁における熱溶着による固定箇所が着用者の肌に当接することを抑制する。【解決手段】吸収性物品１は、吸収性本体ＡＢと、一対のサイドフラップ７、７と、一対の防漏壁５、５と、を備え、吸収性本体における一対のサイドフラップの間に接合され、幅方向に伸縮可能な伸縮部材１１、を備える。一対の防漏壁の各々は、幅方向の外側が固定端とされ、幅方向の内側が自由端とされた起立部５ｃと、起立部の長手方向の一方の端部に隣接し、伸縮部材と厚さ方向に重なる支持部５ｂと、を含む。支持部５ｂは、幅方向の内側に位置し、吸収性本体に固定されていない内側部５ＳＩと、幅方向の外側に位置し、吸収性本体に熱溶着部５０で固定される外側部５ＳＯと、を含む。【選択図】図３
