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).本發明提供一種褲型穿著物品(1),其包括形成外表面之外裝體(3),將前身片F中之外裝體之兩側緣部與後身片R中之外裝體之兩側緣部接合而形成有一對側封部(4)、腰部開口部(8)及一對腿部開口部(9),側封部(4)具有密封緣部(41),該密封緣部(41)係前身片F中之外裝體(3)之緣部(3F)與後身片R中之外裝體(3)之緣部於沿側封部(4)之長度方向延伸之連續線狀之熔合部(40)結合而成,熔合部(40)係於與側封部(4)延伸之方向正交之剖面中,於厚度方向Q之中央部具有沿內外方向P之寬度W較窄之窄幅部(4F),窄幅部(4F)於在厚度方向Q上隔著窄幅部(4F)之兩側具有上述寬度W寬於窄幅部(4F)之寬幅部(4A、4B)。1A‧‧‧腹側部1B‧‧‧背側部3‧‧‧外裝體3F‧‧‧交界部4‧‧‧側封部4a‧‧‧端部4A‧‧‧寬幅部4b‧‧‧端部4B‧‧‧寬幅部4c‧‧‧端部4F‧‧‧窄幅部4g‧‧‧外緣4n‧‧‧內緣40‧‧‧熔合部41‧‧‧密封緣部F‧‧‧前身片P‧‧‧內外方向Q‧‧‧厚度方向R‧‧‧後身片td‧‧‧總厚度W‧‧‧寬度Wa、Wb‧‧‧最大寬度Wc‧‧‧最小寬度Wd‧‧‧總寬度
