An absorbent article (1) comprises an absorbent body (4), and an exterior back sheet (12) disposed further in the outward direction than the absorbent body (4). An identification information writing area (30) for writing identification information indicating a wearer is provided to the surface (12A) on the outward side of the exterior back sheet (12). The identification information writing area (30) is configured so that the material, color, and/or design is different from the exterior back sheet (12) surrounding the identification information writing area (30).