A pants-type wearing article (1) which includes an outer covering (3) forming an outer surface, and in which the following are formed: a pair of side sealing parts (4), to which both side edges of the outer covering in a front of body section (F) and both side edges of the outer covering in a rear of body section (R) are joined a waist opening (8) and a pair of leg openings (9). The side sealing parts (4) include a sealing edge (41) to which an edge (3F) of the outer covering (3) in the front of body section (F) and an edge of the outer covering (3) in the rear of body section (R) are connected by a fusion part (40) that has a continuous linear shape extending in the longitudinal direction of the side sealing parts (4). The fusion part (40) includes, at the center thereof in a thickness direction (Q) in a cross-section that is orthogonal to the direction in which the side sealing parts (4) are extended, a narrow-width part (4F) that exhibits a narrow width (W) in the inside/outside direction (P). The narrow-width part (4F) includes thick-width parts (4A, 4B) that sandwich the narrow-width part (4F) from both sides in the thickness direction (Q) and exhibit widths (W) that are wider than that of the narrow-width part (4F).Linvention concerne un article à porter du type culotte (1), qui comprend un revêtement extérieur (3) formant une surface extérieure, et qui comprend : une paire de parties détanchéité latérales (4) auxquelles sont reliés les deux bords latéraux du revêtement extérieur dans une partie avant dune section de corps (F), et les deux bords latéraux du revêtement extérieur dans une partie arrière dune section de corps (R) une ouverture de taille (8) et une paire douvertures de jambes (9). Les parties détanchéité latérales (4) comprennent un bord détanchéité (41) auquel sont reliés un bord (3F) du revêtement extérieur (3) à lavant de la section de corps (F) et un bord du revêtement extérieur (3) à larrière de la section de corps (R) par une partie de fus
