This disposable diaper is provided with: a side flap which aligned in the vertical direction comprises a first waist part a crotch part and a second waist part and which comprises a first sheet member and a second sheet member which are placed over one another a fastening tape which is bonded to the second waist part side of the side flap and a cut line which is provided on the second waist part side of the side flap and along which multiple holes are aligned which pass through the first sheet member and the second sheet member. The first sheet member comprises a first hole edge portion along the outer peripheral portion of a first hole and a second hole edge portion along the outer peripheral portion of a second hole adjacent to the first hole and the first hole edge portion and the second hole edge portion overlap with the bonding area where the first sheet member and second sheet member placed over one another are bonded.
