It is possible to provide an absorbent article which can easily deform the portion corresponding to the absorbent core of the wearer's buttocks toward the cup shape and can suppress leakage of body fluid. The absorbent article (10) has a width direction (W) in which the front-rear direction (L) and the front-rear direction intersect perpendicularly, a front-surrounding area (S1), and a surrounding area (S2), and is disposed. An sub-femoral region (S3) between the anterior and posterior iliac crest domains and an absorbent core (51) extending at least from the sub-femoral region across the posterior condyle, and extending in the width direction in the region surrounding the posterior condyle Elastic member (32). The absorbent core is a pair of rear side slits (56) having a center on the both sides in the width direction. The back side slit of the pair extends from the rear side edge toward the front side in the region around the breech. The length in the width direction of the rear side edge of the rear side slit is longer than the length in the width direction of the front side edge of the rear side slit.可以提供可以容易將相當於穿著者的臀部的吸收芯的部分更朝杯形狀變形，可以抑制體液的漏出的吸收性物品。吸收性物品(10)，是具有：前後方向(L)、及朝前後方向垂直交叉的寬度方向(W)、及前胴周圍域(S1)、及後胴周圍域(S2)、及被配置於前胴周圍域及後胴周圍域之間的股下域(S3)、及至少從股下域橫跨後胴周圍域延伸的吸收芯(51)、及在後胴周圍域中朝寬度方向伸縮的彈性構件(32)。吸收芯，是具有將寬度方向的中心挾持地位於兩側的一對的後側開縫(56)。一對的後側開縫，是在後胴周圍域中從後側緣朝向前側延伸。後側開縫的後側緣的寬度方向中的長度，是比後側開縫的前側緣的寬度方向中的長度更長。
