This absorbent article minimizes contact between a wearer's skin and places in a leak prevention wall that are anchored by heat welding. An absorbent article (1) comprises an absorbent body (AB), a pair of side flaps (7, 7), and a pair of leak prevention walls (5, 5), and comprises an expansion/contraction member (11) that is joined to the absorbent body between the pair of side flaps and can expand and contract in a width direction. Each of the pair of leak prevention walls includes a standing section (5c), the outer side of which in the width direction is an anchored end and the inner side of which in the width direction is a free end, and a support section (5b) that is adjacent to one end section of the standing section in a lengthwise direction and overlaps with the expansion/contraction member in a thickness direction. Each support section (5b) includes an inner side section (5SI) that is positioned to the inner side in the width direction and is not anchored to the absorbent body, and an outer side section (5SO) that is positioned to the outer side in the width direction and is anchored to the absorbent body at a heat weld section (50).Cet article absorbant réduit le contact entre la peau de l'utilisateur et la paroi antifuite fixé par soudage à chaud. Il comprend un corps absorbant (AB), une paire de rabats latéraux (7, 7), une paire de parois de prévention de fuites (5, 5), et un élément de dilatation/contraction (11), relié au corps absorbant entre la paire de rabats latéraux, qui peut s'étendre et se contracter dans le sens de la largeur. Chaque paroi de prévention de fuites comprend une section verticale (5c), dont le côté externe dans le sens de la largeur est ancrée, et dont le côté interne dans le sens de la largeur est libre. Le support (5b) est adjacent à l'extrémité de la section debout dans, et chevauche l'élément de dilatation/contraction dans le sens de l'épaisseur. Chaque section de support (5b) comprend une section latérale interne (5 SI) sur l
