Provided is an absorbent article for pet animals that has an absorbent core, the end of which fits well to the body of the pet animal. The absorbent article has a ventral elastic body (35) extending in the lateral direction (X) in the ventral region (11). An absorbent core (51) is arranged only closer to the ventral region (11) than an opening which is disposed in a middle region (13) and through which the tail (6) of a pet animal (5) passes. The absorbent core (51) has a first end part (51a) disposed on the ventral side (11) thereof, and in planar view, the first end part (51a) of the absorbent core (51) overlaps with the ventral elastic body (35).
