An object of the present invention is to prevent a gap from being formed between an absorbent article and a skin surface when worn. 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 portion 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 portion in the longitudinal direction of the upright portion, and an elastic member And a support portion 5b overlapping in the thickness direction. The support part 5b is fixed to the absorptive main body by the heat welding part 50. Each of the pair of side flaps is folded inward in the width direction at a position of a fold line passing through the support portion and extending along the longitudinal direction in plan view. [Selection] Figure 3【課題】着用時に吸収性物品と肌面との間に隙間が形成されることを抑制する。【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、吸収性本体に熱溶着部５０で固定される。一対のサイドフラップの各々は、平面視で支持部を通り長手方向に沿って延びる折り線の位置で、幅方向の内側に折り畳まれる。【選択図】図３
