The present invention is a disposable diaper comprising a pocket that houses and holds excrement which moves toward the waist opening side in a rear waist region, and with which it is possible to prevent excrement from contacting the wearer's skin. In this disposable diaper (10), a rear waist region (14) comprises: a band-shaped region (skin-contacting region) (23) that is located on the skin-opposing surface side, and that extends along the lateral direction (X)； and a pocket-forming section (20) including a pocket (30) that is located on the non-skin-opposing surface side, and that opposes the band-shaped region (23) in the front-to-rear direction in a central section in the lateral direction (X). The pocket-forming section (20) includes: side fixing sections (45) that are fixed to the band-shaped region (23)； a pocket inside region (42) that extends upward from a section connected to the band-shaped region (23) between both side fixing sections (45)； and a pocket outside region (43) that opposes the pocket inside region (42) in the front-to-rear direction via a bending section (33) extending along the lateral direction (X), and that extends toward the crotch region (15) side. The band-shaped region (23) can elastically expand/contract in the lateral direction (X), and between both side fixing sections (45), the contraction rate of the band-shaped region (23) is greater than the contraction rate of the pocket outside region (43).La présente invention concerne une couche jetable comprenant une poche qui reçoit et conserve les excréments qui se déplacent vers le côté d'ouverture vers la taille dans une région de taille arrière, et à l'aide de laquelle il est possible d'empêcher que les excréments n'entrent en contact avec la peau de l'utilisateur. Dans cette couche jetable (10), une région (14) de taille arrière comprend : une région en forme de bande (région de contact avec la peau) (23), qui est située sur le côté de la surface opposée à la peau, et qui s'étend le
