A pull-on absorbent article 1 includes a front panel 2A, a rear panel 2B, an absorbent assembly 3, and a pair of side seals 4. The rear panel 2B includes a rear extension portion 21b extending downward from the side seals 4. The absorbent assembly 3 includes an oblong absorbent member 33 and a pair of side sheet portions 34 located laterally outwardly from the respective edges of the absorbent member 33 and forming a pair of side gathers 34c in at least the crotch portion C of the article 1. Each side sheet portion 34 has a non-bonded region 34N not bonded to the rear extension portion 21b in a portion thereof overlapping the rear panel and nearer the crotch portion C. Elastic members 36 forming the side gathers 34c extend in the non-bonded region so that the side sheet portion 34 is elasticized in the non-bonded region, too.本發明之褲型吸收性物品1具有腹側片材構件2A、背側片材構件2B、吸收性本體3及側封部4、4。背側片材構件2B具有較側封部4更向下方延伸之背側延伸部21b。吸收性本體3具有縱長之吸收體33、及位於較吸收體33之長度方向之兩側緣各自更靠外側且至少於跨下部C形成側部皺褶34c之側部片材部34。側部片材部34於與背側片材構件重疊之部分的靠近跨下部C之部分,具有對於背側延伸部21b之非接合部34N,側部皺褶34c形成用之彈性構件36亦延伸至該非接合部中,側部片材部34於該非接合部中亦表現出伸縮性。1...褲型拋棄式尿片2A...腹側片材構件2B...背側片材構件2a、2b...側緣部2a、2b、34A...接合部2c...上緣部2d...下緣部3...吸收性本體3a、3b、36b...端部4...側封部20a...腹側本體部20b...背側本體部21a...腹側延伸部21b...背側延伸部22a、23a...延伸折回部23...內層片材24、36...彈性構件30...線狀接合部34...側部片材部34N...非接合部A...腹側部B...背側部C...跨下部G1...腰部伸縮部G2...腹圍伸縮部G3...延伸部伸縮部L...尿片全長L2、L3、L4、La、Lb...長度L5、L6...延伸長度
