An absorbent article includes a polymer sheet (4) where a superabsorbent polymer (12) is disposed between an upper layer sheet (10) disposed on a skin side and a lower layer sheet (11) disposed on a non-skin side. The diffusion area of the lower layer sheet (11) is 1500 mm<；sup>；2<；/sup>；or greater. The diffusion area is measured by an absorption test method including: (1) preparing a specimen with a size of 100 mm x 100 mm, (2) placing a tip of a buret at a height of 10 mm above a surface of the specimen, and dropping one droplet of ion-exchanged water from the buret, and (3) after 3 minutes from a time when the droplet reaches the surface of the specimen, measuring, as the diffusion area, an area of a region of the surface of the specimen where a reflection from water is clearly visible.
