The purpose of the present disclosure is to provide an absorbent article in which bodily fluid easily flows in the longitudinal direction of an absorbent core and leakage at a crotch region is suppressed. An absorbent article according to the present disclosure has the following configuration. An absorbent article (1) is characterized in that: an absorbent core (9) includes a first layer (17) and a second layer (19) that are adjacent to each other in the thickness direction (T); the first layer (17) has, in a front-body part (FP), (i) a groove (25) extending in the longitudinal direction (L), penetrating in the thickness direction (T), and having a terminal end (27) at a rear (RD) position and (ii) a base (29) disposed adjacent to the rear (RD) position of the groove (25) with the terminal end (27) therebetween; the second layer (19) has a groove corresponding part (33) and a base corresponding part (35) at positions overlapping the groove (25) and the base (29) respectively in the thickness direction (T); and the average density of highly absorbent polymer particles (23) contained in the base (29) and the average density of the highly absorbent polymer particles (23) contained in the base corresponding part (35) are higher than the average density of the highly absorbent polymer particles (23) contained in the groove corresponding part (33).