A diaper (1), which is an embodiment of the present invention, is provided with a front sheet (2), a back sheet (3), and an oblong absorbent body (4) disposed between the front and back sheets (2, 3). The absorbent body (4) has an absorbent core (41). The absorbent core (41) has: vertical grooves (44Y) that extend in the vertical direction (the Y direction)； horizontal grooves (44X) that extend in the horizontal direction (the X direction)； and block-shaped areas (411) that are positioned at locations partitioned by the vertical grooves (44Y) and the horizontal grooves (44X), and comprise multiple oblong high basis weight areas (43), which have a higher basis weight than the locations of each of the vertical grooves (44Y) and the horizontal grooves (44X). The high basis weight areas (43) of the absorbent core (41), and low basis weight areas (44) comprising locations positioned at each of the vertical grooves (44Y) and the horizontal grooves (44X) are integrally formed. The vertical grooves (44Y) and the horizontal grooves (44X) are formed so as to have the same thickness, or the horizontal grooves are formed more thinly. In a plan view, the width of the horizontal grooves (44X) is formed more widely than the width of the horizontal grooves (44Y).作為本發明之實施形態之尿布(1)包括正面片材(2)、背面片材(3)、及配置於該等兩片材(2、3)間之縱長之吸收體(4)。吸收體(4)具有吸收性芯體(41)。吸收性芯體(41)具有塊狀形狀區域(411)，該塊狀形狀區域(411)包括沿縱方向(Y方向)延伸之縱槽(44Y)、沿橫方向(X方向)延伸之橫槽(44X)、及配置於由縱槽(44Y)及橫槽(44X)劃分之部位且與縱槽(44Y)及橫槽(44X)各者之部位相比基重較高的複數個縱長之高基重部(43)。吸收性芯體(41)之高基重部(43)、與包括位於縱槽(44Y)及橫槽(44X)之各者之部位的低基重部(44)係成形為一體，縱槽(44Y)與橫槽(44X)之厚度相同或橫槽較薄，且於俯視時，形成為橫槽(44X)之寬度大於縱槽(44Y)之寬度。
