To provide a leakproof cuff with an excellent side leakage preventing function, in a brief-type or open-type disposable diaper.

In the disposable diaper, the leakproof cuffs 40A have a reduced standable height in the middle portions of the diaper by forming a plurality of bond parts 21 and 22, and have an increased standable height in the front and rear thereof. In the disposable diaper, the leakroof cuff is easily erectable in the middle portion, and the front and rear thereof, in being worn, and its shape can be easily kept. Further, the brief-type diaper is easier to wear, since the foot is caught at the leakproof cuff 40A in attachment.