In order to improve fit on the wearer's buttocks and to suppress excrement leakage, an absorbent core (31) of this absorbent article comprises a pair of first low-basis-weight regions (41) which extend from both outside edges of the absorbent core inwards in the width direction, and a second low-basis-weight region (42) which extends in the longitudinal direction along a centerline connecting the width-direction center in the rear area. The basis weight of the first low-basis-weight regions and the basis weight of the second low-basis-weight region are less than the basis weight of the outside edges of the absorbent core in the rear area (S3). The pair of first low-basis-weight regions (41) are separated in the width direction, and, of the center area (S1), the rear area (S3) and the intermediate area (S4), are arranged only in the intermediate area (S4).
