An absorbent article according to one aspect of the present invention includes an absorbent core having a front square core portion and a rear core portion located on both end sides in the front-rear direction, and the front core portion and the back The middle core part between the core parts. The intermediate core portion has: a high basis weight portion located in a central region in the width direction and a basis weight higher than the front core portion and the rear core portion； and a low basis weight portion located on both sides in the width direction , And has a lower basis weight than the above-mentioned high basis weight part. The high basis weight portion has: a high basis weight and high thickness portion located at the center portion in the width direction； and a high basis weight and low thickness portion located on both sides in the width direction of the high basis weight portion and high thickness portion, and the thickness is higher than the above The base weight is high and the thickness is thin. The rear core portion has a wide longitudinal groove portion extending in the front-rear direction and located behind the high basis weight and high thickness portion, and a narrow longitudinal groove portion narrower than the wide longitudinal groove portion .本發明之一形態之吸收性物品具備吸收性芯體，該吸收性芯體具有位於前後方向之兩端部側之前方芯體部及後方芯體部、以及位於上述前方芯體部與上述後方芯體部之間之中間芯體部。上述中間芯體部具有：高基重部，其位於寬度方向中央區域，且基重較上述前方芯體部及上述後方芯體部高；以及低基重部，其位於寬度方向兩側方區域，且具有較上述高基重部低之基重。上述高基重部具有：高基重高厚度部，其位於寬度方向中央部；以及高基重低厚度部，其位於上述高基重部高厚度部之寬度方向兩側，且厚度較上述高基重高厚度部薄。上述後方芯體部具有沿著前後方向延伸之、位於上述高基重高厚度部之後方之寬幅縱溝槽部、及相較於上述寬幅縱溝槽部窄之窄幅縱溝槽部。
