A pull-on absorbent article 1 including a front outer cover 2A to be worn around a wearer's front side, a rear outer cover 2B to be worn around the wearer's rear side, and an absorbent assembly 3 fixed to the front and the rear outer cover so as to bridge them and having a pair of side seals 4 and 4. The length of each of the front and the outer cover 2A and 2B in the longitudinal direction of the article is uniform in the lateral direction and larger than that of the side seals 4 so that the front and the outer cover have extension portions 21a and 21b, respectively, that extend downward from the side seals. The extension portion 21a and/or the extension portion 21b of the front and/or the rear outer cover has/have an elasticized region extensible in the lateral direction in a region located laterally outward of each side edge of the absorbent assembly 3.本發明之褲型吸收性物品1包括配置於穿著者之腹側之腹側外裝體2A、配置於穿著者之背側之背側外裝體2B、以及以架設於腹側外裝體及背側外裝體之方式而固定之吸收性本體3，並具有側封部4、4，且腹側外裝體2A及背側外裝體2B中，各自吸收性物品縱向之長度於橫向上均一，且長於側封部4之長度，並分別具有較該側封部更於下方延出之延出部分21a、21b，腹側外裝體及/或背側外裝體之延出部分21a、21b中之位於較吸收性本體3之兩側緣各自更靠外之位置的部分於吸收性物品之橫向上具有伸縮性。
