In order to maintain and improve the ability to absorb highly viscous excretory fluids and prevent the highly viscous excretory fluids from soaking through a surface sheet, this absorbent article (1) has an absorbent body (4) provided with an absorbent core (4a) and a fiber mass layer (4b) comprising a plurality of fiber masses (40). The fiber masses comprise: a core part (41) that has a high fiber density and is difficult to crush； and a projecting fiber part (42) that projects outward from the core part, has a low fiber density, and is easy to crush. The specific volume of the fiber mass layer when a pressure of 3 g/cm2 is applied is referred to as reference specific volume, the specific volume of the fiber mass layer when a pressure of more than 3 g/cm2 is applied is referred to as load specific volume, the ratio of the load specific volume to the reference specific volume is referred to as specific volume ratio, and the ratio of a change in the specific volume ratio to a change in the pressure applied to the fiber mass layer is referred to as change ratio. A pressure change from 3 to 5 g/cm2 corresponds to a change ratio of -0.12 to -0.025 (g/cm2)-1, and a pressure change from 25 to 30 g/cm2 corresponds to a change ratio of -0.02 to 0 (g/cm2)-1.Selon l'invention, afin de maintenir et d'améliorer la capacité d'absorber des fluides excrétoires hautement visqueux et d'empêcher les fluides excrétoires hautement visqueux de s'infiltrer à travers une feuille de surface, cet article absorbant (1) a un corps absorbant (4) ayant une âme absorbante (4a) et une couche de masse de fibres (4b) comprenant une pluralité de masses de fibres (40). Les masses de fibres comprennent : une partie d'âme (41) qui a une densité de fibres élevée et est difficile à écraser ； et une partie de fibre en saillie (42) qui fait saillie vers l'extérieur depuis la partie de noyau, a une faible densité de fibres, et est facile à écraser. Le volume spécifique de la couche de masse de fibres lorsqu
