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).La présente invention concerne une couche (1) qui est un mode de réalisation de la présente invention, et qui est dotée d'une feuille avant (2), d'une feuille de support (3), et d'un corps absorbant oblong (4) disposé entre les feuilles avant et de support (2, 3). Le corps absorbant (4) a un cœur absorbant (41). Le cœur absorbant (41) possède : des sillons verticaux (44Y) qui s'étendent dans le sens vertical (la direction Y) ； des sillons horizontaux (44X) qui s'étendent dans le sens horizontal (la direction X) ； et des zones en forme de blocs (411) qui sont positionnées au niveau d'emplacements séparés par les sillons verticaux (44Y) et les sillons horizontaux (44X), et comprennent de multiples zones oblongues de masse sur
