Provide a disposable underwear that fits well to the body and can suppress slippage.The pants-type diaper (1) comprises a belly side member (11), a back side member (12), a crotch member (5) connecting both members, a left end of the belly side member (11) and the back side member Side member (11), the back side member (12), and the crotch member (5) by joining the right and left ends (15a, 15b) and the right end portions (15c, 15d) (11, 12) extending in the right-and-left direction of each of the front member (11) and the back member (12), the waist portion extending along each upper edge of the members And waist elastics (21, 21a, 21b) disposed in the region above the left and right leg openings (13, 14) below the waist elastic bodies (4, 4a, 4b) , 21 b) gradually decreases in tightening force from the lumbar part (4, 4 a, 4 b) side toward the left and right leg opening parts (13, 14) side.身体に良好にフィットし、ずれ落ちを抑制することができる使い捨て下着を提供する。パンツ型おむつ(1)は、腹側部材(11)と、背側部材(12)と、両部材をつなぐ股部材(5)と、腹側部材(11)及び背側部材(12)の左端部(15a,15b)同士及び右端部(15c,15d)同士が接合されることにより、腹側部材(11)と背側部材(12)と股部材(5)とに囲まれて形成される左右の脚開口部(13,14)と、腹側部材(11)及び背側部材(12)の各左右方向に延在し、両部材(11,12)の各上端縁に沿った腰部(4,4a,4b)の下で左右の脚開口部(13,14)の上の領域に配置された胴周り弾性体(21,21a,21b)とを備え、胴周り弾性体(21,21a,21b)の少なくとも一部は、腰部(4,4a,4b)側から左右の脚開口部(13,14)側に向かうにつれて徐々に締め付け力が弱くなることを特徴とする。
