Disclosed is a disposable diaper that can be disposed of rolled, folded, or the like. A barrier flap (60L, 60R) is formed on each side of a groin region (8) of the disposable diaper (1). Each of the barrier flaps (60L, 60R) is in the state of being folded in the widthwise direction (X) of the diaper (1), and the folded barrier flaps (60L, 60R) are each attached detachably to themselves at the ends (60a, 60b) in the lengthwise direction (Y). When the barrier flaps (60L, 60R) that are folded and mutually attached at each end (60a, 60b) are each detached and the barrier flaps (60L, 60R) are extended in a manner so that the proximal edge (62) of the barrier flaps (60L, 60R) faces inward in the widthwise direction (X), the barrier flaps (60L, 60R) partially overlap.
