A pants-type absorbent article (1) which includes an absorbent body (10) that is provided with an absorbent core (11) arranged along the vertical direction and that is folded at a lower end in the vertical direction to form a front side and a rear side, wherein the absorbent core (11) has a rear portion (10R), which is the portion folded to the rear side in the front-rear direction, and the absorbent core (11) has, in the rear portion (10R), a rear low basis weight region (39) which has an average basis weight that is lower than the surrounding regions and a buttocks high basis weight region (55) which is provided more toward the top in the vertical direction than the rear low basis weight region (39) and which has an average basis weight that is higher than the rear low basis weight region (39), and at least a portion of a boundary portion (55BF) between the rear low basis weight region (39) and the buttocks high basis weight region (55) inclines diagonally downward toward opposite outer sides from the center in the right direction.本發明的課題係在於提供在吸收性芯材的胯下部及臀部可實現良好的貼身性之短褲型吸收性物品。用以解決課題之手段為，一種短褲型吸收性物品，係具有具備沿著上下方向配置之吸收性芯材(11)，且在上下方向的下端部朝前後折彎之吸收性本體(10)的短褲型吸收性物品(1)，其特徵為，吸收性芯材(11)係具有朝前後方向的後側折彎之部分亦即後側部(10R)，吸收性芯材(11)係在後側部(10R)，具有平均基重較周圍的區域低之後側低基重區域(39)和設在較後側低基重區域(39)更靠近上下方向的上側且平均基重較後側低基重區域(39)高之臀部高基重區域(55)，後側低基重區域(39)與臀部高基重區域(55)之邊界部(55BF)的至少一部分係從前述左右方向的中央朝兩外側，向斜下方向傾斜。
