An underpants-style absorbent article (1) has a longitudinal direction corresponding to the front-back direction of the wearer and a transverse direction that orthogonally crosses the longitudinal direction, and is provided with: an absorbent main body (10) that includes an absorbing body and that has a tridimensional gather disposed on both side sections of the longitudinal direction and an exterior member (11) disposed on the non-skin-facing side of the absorbent main body. A pair of side sealed sections (S, S), a waist opening (5), and a pair of leg openings (6, 6) are formed by bonding both side sections of an abdominal-side section located on the abdominal side of the wearer to both side sections of a backside section located on the back side of the wearer. In a natural flat state, an angle (θ) formed between a first hypothetical straight line (L1), which connects a lower edge (Sd) of the side sealed section and a leading end (8a) of the tridimensional gather, and a second hypothetical straight line (L2), which passes through the leading end (8a) of the tridimensional gather and extends in the traverse direction, is 40-60o. The tridimensional gather (8) is disposed in such a way that the leading end (8a) thereof is located closer to the center in the traverse direction of the underpants-style absorbent article than a rising base end (8b) of the tridimensional gather.Un sous-vêtement absorbant (1) est composé dun corps absorbant (10) tridimensionnel sur les deux sections latérales, et dun élément extérieur (11) sur le côté non tourné vers la peau. La section latérale scellée (S, S), louverture de la taille (5) et les ouvertures de jambes (6, 6) sont formées par lassemblage des deux sections latérales abdominale sur les deux sections latérales arrière sur le côté postérieur de lutilisateur. A plat, un angle (theta) entre une première ligne droite hypothétique (L1), relie le bord inférieur (Sd) de la section étanche latérale et lextrémité avant (8a) de lensemble t
