To provide a pull-on disposable diaper where tearing property of a side seal is excellent.A side seal S has a bonded region 40 continuously extending in a longitudinal direction X. Elastic members 80a and 80b extending in a lateral direction Y are arranged in both of a front portion A and a rear portion B in the longitudinal direction at intervals. In one of the front portion A and the rear portion B, end portions of the end portions of the elastic members 80a and 80b located close to the side seal S do not reach the side seal S and terminal at positions located close to the inside of the side seal in the lateral direction, so that an elastic member-less region 9b is formed. In the elastic member-less region 9b, adhesive agent 10b is intermittently applied, along the longitudinal direction X, at positions of on an extended line extending from the positions where the elastic members 80a and 80b are arranged in the lateral direction Y, so that end portions of the elastic members 80b are fixed by the adhesive agent 10b.本創作提供一種側封部之剝離性良好之褲型拋棄式尿布。側封部(S)具有沿縱向(X)連續地延伸之接合部(40)。沿橫向(Y)延伸之彈性構件(80a)、(80b)係於縱向(X)上隔開間隔而於伸長狀態下配置於腹側部(A)及背側部(B)之兩者。於腹側部(A)及背側部(B)之一者，彈性構件(80a)、(80b)之端部中之位於靠側封部(S)之端部未到達至側封部(S)之位置，而於較側封部更靠橫向之內側之位置終止，從而形成彈性構件非配置區域(9b)。於彈性構件非配置區域(9b)，在自配置有彈性構件(80a)、(80b)之位置向橫向(Y)延伸之延長線上之位置，沿縱向(X)而間斷地施加有接著劑(10b)，藉由接著劑(10b)而固定彈性構件(80b)之端部。
