To provide a disposable diaper capable of improving a fitting feeling with a leg of a wearer in a tape type diaper and sufficiently exhibiting a leakage preventing property in a leg opening opening portion.SOLUTION: In the disposable diaper, the end portion E2 of the back side B in the product longitudinal direction L of the crotch gather 22 is located at the line L1 where the outer edge portion 4E1 in the product width direction W of the back side side flap portion 4 crosses the fastening tape 5 Is disposed on the back side B in the product longitudinal direction L than the extension line L2 connecting the end portion EL1 on the antinode side in the product longitudinal direction L and the end portion E1 on the back side B in the product longitudinal direction L of the leg gather 21 , The end portion E 1 of the back side B of the leg gather 21 in the product longitudinal direction L is located on the back side B in the product longitudinal direction L than the end portion 4 E 2 on the antinode side in the product longitudinal direction L of the back side side flap portion 4 Has been done.(FIG.【課題】テープ型おむつにおいて、着用者の脚との間のフィット感を向上させると共に、脚回り開口部における防漏性を十分に発揮する使い捨ておむつを提供する。【解決手段】使い捨ておむつでは、股下ギャザー22の製品長手方向Lの背側Bの端部E2は、背側サイドフラップ部4の製品幅方向Wの外縁部4E1及びファスニングテープ5が交わる線L1の製品長手方向Lの腹側の端部EL1とレッグギャザー21の製品長手方向Lの背側Bの端部E1とを結ぶ延長線L2よりも、製品長手方向Lの背側Bに配置されており、レッグギャザー21の製品長手方向Lの背側Bの端部E1は、背側サイドフラップ部4の製品長手方向Lの腹側の端部4E2よりも、製品長手方向Lの背側Bに配置されている。【選択図】図2
