A pull-on disposable diaper (1A) of the present invention includes a pair of side-sealing sections (8, 8) each being formed by fusion-bonding of respective overlapped sections (7, 7) where opposite side-edge sections (6a, 6a) of a stomach-side section (A) and opposite side-edge sections (6b, 6b) of a back-side section (B) overlap one another. In the pull-on disposable diaper (1A), each of the side-sealing sections (8, 8) includes regions each having a different total basis weight of members that make up each overlapped section (7). Each overlapped section (7) of the pull-on disposable diaper (1A) is made up of a plurality of members. The larger the total basis weight of the respective basis weights of the plurality of the members is in a region of the side-sealing section (8), the smaller the fusion-bonded area is made in that region of the side-sealing section (8).本發明之褲型拋棄式尿片(1A)具有一對側密封部(8、8),該一對側密封部(8、8)係將腹側部(A)之兩側邊部(6a、6a)與背側部(B)之兩側邊部(6b、6b)互相重合之重合部(7、7)融著而形成。於褲型拋棄式尿片(1A)中,於側密封部(8、8)存在構成重合部(7、7)之構件之總計基重不同的部位。褲型拋棄式尿片(1A)之重合部(7)包含複數個構件,複數個該構件各自基重之總計基重越大之區域,一對側密封部(8、8)之融著面積形成為越小。6a1、6a2、6a3、6b1、6b2、6b3...區域7...重合部8a1、8a2、8a3...密封區域61...外層薄片61a、61b...折返部61a1、61b1...端邊62...內層薄片62c...兩端63...腰部彈性構件64...腿部彈性構件81、82...融著部X...寬度方向Y...長度方向α...融著部81與融著部82交叉之角度
