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 multiple hole edge portions corresponding to the aforementioned multiple holes, each of the hole edge portions is disposed along the outer periphery of the hole, and at least one of the aforementioned multiple hole edge portions does not overlap with the bonding area where the first sheet member and second sheet member placed over one another are bonded.
