The present invention is to provide a disposable pull-on diaper ensuring the diaper to be kept in close contact with the wearer's crotch region.A disposable pull-on diaper (10) includes a lower torso cover (1) and an absorbent chassis (2). The absorbent chassis (2) has a front end portion (26) overlapping a front waist region (3) of the lower torso cover (1) and a front end portion (26a) of the front end portion (26) is joined to an elastic region in the lower torso cover (1). A front end adjoining portion (26b) of the front end portion (26) is not joined to the elastic region. An area in the absorbent chassis (2) being adjacent the front end adjoining portion (26b) on the side of the crotch region (4) is joined to an inelastic region defined on the side closer to the crotch region (4) than to the elastic region. The absorbent body contained in the absorbent chassis (2) extends at least from the crotch region (4) to the front end adjoining portion (26b). The front end portion (26a) in the front end portion (26) of the absorbent chassis (2) is defined by a portion of the cover sheet wrapping the absorbent body which extends outward beyond the absorbent body.
