PROBLEM TO BE SOLVED: To provide an underpants-type disposable diaper having external appearance like an underwear, making a wearer hardly feel pain even when touching a side seal part, and easy to be torn off at a side seal part when the wearer takes it off.SOLUTION: An exterior body 3 is formed by including a laminate of a stretchable sheet 30 containing elastic fiber and non-elastic fiber, and a non-stretchable sheet not containing elastic fiber. The thickness of a side seal part 4 is large, compared to that of parts excluding the side seal part, of a ventral part F and a back side part R forming the side seal part. An outside end face 40 of the side seal part is formed with a smooth area in which the outside end face is smooth, and elastic fiber exists in the smooth area.COPYRIGHT: (C)2015,JPO&INPIT【課題】下着のような外観を有し、サイドシール部に触れても痛みを感じ難く、脱ぐときにサイドシール部で引き裂きやすいパンツ型使い捨ておむつを提供する。【解決手段】外装体3は、弾性繊維及び非弾性繊維を含む伸縮シート30と弾性繊維を含んでいない非伸縮シートとの積層体を含んで構成されている。サイドシール部4の厚みは、これを構成する腹側部F及び背側部Rそれぞれの該サイドシール部以外の部分の厚みに比して大きい。サイドシール部の外側端面40に、該外側端面が平滑な平滑領域が形成され、該平滑領域内に弾性繊維が存している。【選択図】図5
