A pull-on absorbent article having a longitudinal direction corresponding to the front-to-back direction of a wearer and a lateral direction perpendicular to the longitudinal direction, having a front portion adapted to be worn about a wearer's front, a rear portion adapted to be worn about a wearer's back, and a crotch portion intermediate between the front and rear portions, and having a waist opening and a pair of leg opening, the pull-on absorbent article comprising an absorbent assembly comprising a liquid permeable topsheet, an absorbent member and a leak-proof sheet and a leak-proof cuff extending in the longitudinal direction along each lateral side of the absorbent assembly, each leak-proof cuff being formed of nonwoven fabric and having a fixed edge along one of its lateral side edges and a free edge on the other side, each leak-proof cuff having opposite longitudinal ends, one in the front portion and the other in the rear portion, and having a fixed end portion fixed to the topsheet near each longitudinal end, each leak-proof cuff having an elasticized region in which an elastic member is fixed along near the free edge, the fixed edge and the elasticized region of each leak-proof cuff being laterally spaced at a first distance of 10 mm or longer, and the elasticized region and the fixed end portion of each leak-proof cuff being longitudinally spaced at a second distance, the second distance being equal to or smaller than the first distance in at least one of the front portion and the rear portion, and the nonwoven fabric having a mean deviation of surface roughness of 2.2 μm or less and a mean deviation of coefficient of friction of 0.012 or less, the mean deviation of surface roughness and the mean deviation of coefficient of friction being measured according to the method described in the description, wherein the absorbent assembly comprises the absorbent member, at least one of the front portion and the rear portion comprises a laterally extending elasticized waist region located closer to the waist opening than the longitudinal end of the absorbent member and a pair of laterally extending elasticized side regions each located laterally outside of the absorbent assembly, each elasticized side region comprises an elasticized fixed end region, the elasticized fixed end region containing the fixed end portion and extending laterally outward from the fixed end portion, and the elasticized fixed end region has a higher extensional stress than the elasticized waist region. the pull-on absorbent article comprising an absorbent assembly comprising a liquid permeable topsheet, an absorbent member and a leak-proof sheet and a leak-proof cuff extending in the longitudinal direction along each lateral side of the absorbent assembly, each leak-proof cuff being formed of nonwoven fabric and having a fixed edge along one of its lateral side edges and a free edge on the other side, each leak-proof cuff having opposite longitudinal ends, one in the front portion and the other in the rear portion, and having a fixed end portion fixed to the topsheet near each longitudinal end, each leak-proof cuff having an elasticized region in which an elastic member is fixed along near the free edge, the fixed edge and the elasticized region of each leak-proof cuff being laterally spaced at a first distance of 10 mm or longer, and the elasticized region and the fixed end portion of each leak-proof cuff being longitudinally spaced at a second distance, the second distance being equal to or smaller than the first distance in at least one of the front portion and the rear portion, and the nonwoven fabric having a mean deviation of surface roughness of 2.2 μm or less and a mean deviation of coefficient of friction of 0.012 or less, the mean deviation of surface roughness and the mean deviation of coefficient of friction being measured according to the method described in the description, at least one of the front portion and the rear portion comprises a laterally extending elasticized waist region located closer to the waist opening than the longitudinal end of the absorbent member and a pair of laterally extending elasticized side regions each located laterally outside of the absorbent assembly, each elasticized side region comprises an elasticized fixed end region, the elasticized fixed end region containing the fixed end portion and extending laterally outward from the fixed end portion, and the elasticized fixed end region has a higher extensional stress than the elasticized waist region.