A pull-on disposable diaper of which the crotch portion snugly fits the wearers groins to have a neat appearance is provided. The disposable diaper 1 has a waist opening 5 and a pair of leg openings 6. The diaper 1, in its flat-out state, has a length M of 210 to 280 mm between the lower end of the flap F in the longitudinal front portion and the lower end of the flap F in the longitudinal rear portion. A width N ranges 50 to 160 mm in the narrowest part of the diaper near the longitudinal central portion thereof.本發明之目的在於提供一種褲型可丟棄尿布,其可使尿布之胯下部緊貼於穿用者之鼠蹊部,尿布之胯下部外觀平整。本發明之褲型可丟棄尿布1具有腰開口部5及一對腿開口部6。在尿布1之展開狀態中,長度方向前側部之摺翼部F之下端緣、及後側部之摺翼部F之下端緣之間之距離M設成210至280 mm。此外,尿布1之長度方向中央部附近之最小寬度部之寬度N設成50至160 mm。51...腰部彈性構件61a,61b...腿部彈性構件71...第一區域71a...第一彈性構件72...第二區域72a...第二彈性構件A...腹側部A1,A2...側緣B...背側部B1,B2...側緣C...胯下部CL...長度方向中心線F...摺翼部K1...腹側部A之第一區域71之中心位置及長度方向中心線CL之間的距離K2...背側部B之第一區域71之中心位置及長度方向中心線CL之間的距離L...外包覆材11之全長M...下端間距離N...最小寬度部之寬度W1...第一區域71之寬度(沿尿布1之長度方向之第一區域71的長度)W2...第二區域72之寬度(沿尿布1之長度方向之第二區域72之長度)
