A pants-type disposable diaper, which has a longitudinal direction, a width direction perpendicular to the longitudinal direction, and a thickness direction, the disposable diaper comprising: a front side region positioned at a front side of a center of the disposable diaper in the longitudinal direction, and a rear side region positioned at a rear side of the center of the disposable diaper in the longitudinal direction; an absorber arranged to straddle the front side region and the rear side region; and a pair of three-dimensional gathers having a sheet member and an elastic member and arranged on both outer sides in the width direction with respect to the center of the disposable diaper in the width direction, wherein outer edges of the front side region and the outer edge of the rear side region are bonded, the three-dimensional gather comprises a base end portion incapable of being upright, and an upright portion shrinkable in the longitudinal direction by the elastic member and capable of being upright on the skin side in the thickness direction with the base end portion as a base point, the base end portion comprises: a first base end portion arranged at each of the front side region and the rear side region at both outer edges of the upright portion in the longitudinal direction; and a second base end portion arranged at the outer edge of the upright portion in the width direction, the upright portion comprises a bonded portion in which the sheet members are bonded to each other and a length of the upright portion in the width direction is narrowed, the bonded portion extends over the center of the disposable diaper in the longitudinal direction and is spaced from each of the first base end portions, a distance between the center of the disposable diaper in the longitudinal direction and the rear end edge of the bonded portion is longer than a distance between the center of the disposable diaper in the longitudinal direction and the front end edge of the bonded portion, the disposable diaper comprises a leg gather arranged on the outer side of the three-dimensional gather in the width direction, the leg gather comprises a plurality of leg elastic members arranged at a distance in the width direction, and an elongation rate of the outer leg elastic member positioned on an outermost side in the width direction is lower than an elongation rate of the leg elastic member positioned at an inner side of the outer leg elastic member in the width direction. a front side region positioned at a front side of a center of the disposable diaper in the longitudinal direction, and a rear side region positioned at a rear side of the center of the disposable diaper in the longitudinal direction; an absorber arranged to straddle the front side region and the rear side region; and a pair of three-dimensional gathers having a sheet member and an elastic member and arranged on both outer sides in the width direction with respect to the center of the disposable diaper in the width direction, wherein outer edges of the front side region and the outer edge of the rear side region are bonded, the three-dimensional gather comprises a base end portion incapable of being upright, and an upright portion shrinkable in the longitudinal direction by the elastic member and capable of being upright on the skin side in the thickness direction with the base end portion as a base point, the base end portion comprises: a first base end portion arranged at each of the front side region and the rear side region at both outer edges of the upright portion in the longitudinal direction; and a second base end portion arranged at the outer edge of the upright portion in the width direction, a first base end portion arranged at each of the front side region and the rear side region at both outer edges of the upright portion in the longitudinal direction; and a second base end portion arranged at the outer edge of the upright portion in the width direction, the upright portion comprises a bonded portion in which the sheet members are bonded to each other and a length of the upright portion in the width direction is narrowed, the bonded portion extends over the center of the disposable diaper in the longitudinal direction and is spaced from each of the first base end portions, a distance between the center of the disposable diaper in the longitudinal direction and the rear end edge of the bonded portion is longer than a distance between the center of the disposable diaper in the longitudinal direction and the front end edge of the bonded portion, the disposable diaper comprises a leg gather arranged on the outer side of the three-dimensional gather in the width direction, the leg gather comprises a plurality of leg elastic members arranged at a distance in the width direction, and an elongation rate of the outer leg elastic member positioned on an outermost side in the width direction is lower than an elongation rate of the leg elastic member positioned at an inner side of the outer leg elastic member in the width direction.