The rising portion (51) of the leak-proof flange (5) includes an inner extension portion (52) that extends from the base end portion (50) to the inner side of the transverse direction (Y) and is stretchable in the longitudinal direction (X). . The front part (F) and the rear part (R) are respectively formed with stand-up hindering parts (55) for fixing the inner extension part (52) to the front sheet (2). When wearing, the edge of the upright part (51) of the leak-proof cuff (5) sandwiched between the two ends of the longitudinal direction (X) and the inside extension part (52) The part (52a) is a free end, and the free end stands up toward the wearer's skin side. In the erected state, the free end is located on the inner side of the lateral direction (Y) more than the base end part (50). The absorber (4) has a rear slit region (RS) in the rear part (R), and the erection hindering part (55) of the rear part (R) is located further to the longitudinal rear than the longitudinal rear end of the region (RS).防漏翻邊(5)之立起部(51)包含自基端部(50)向橫向(Y)之內側延伸且於縱向(X)上具有伸縮性之內側延出部(52)而構成。於前方部(F)及後方部(R)，分別形成有將內側延出部(52)固定於正面片材(2)之立起阻礙部(55)。於穿著時，防漏翻邊(5)中之夾於縱向(X)之兩端部之立起阻礙部(55、55)之立起部(51)以內側延出部(52)之緣部(52a)為自由端，該自由端朝向穿著者之皮膚側立起，於該立起狀態下，該自由端位於較基端部(50)更靠橫向(Y)之內側。吸收體(4)於後方部(R)具有後方狹縫區域(RS)，後方部(R)之立起阻礙部(55)位於較該區域(RS)之縱向後端更靠縱向後方。
