Absorbent article

An absorbent article comprising a liquid-permeable top sheet, an absorbent body containing a water-absorbing resin, and a liquid-impermeable back sheet in this order, wherein

• a basis weight of the water-absorbing resin is 300 g/m2 to 1000 g/m2, and
• the water-absorbing resin is a particulate poly(meth)acrylic acid (salt)-based water-absorbing resin and has the following physical property values (1) to (3):
• (1) a vertical liquid diffusion length (D) is 15 mm or more;
• (2) a ratio (L/D) of a horizontal liquid diffusion length (L) to the vertical liquid diffusion length is 0.5 to 1.5;
• and
• (3) a bulk density defined in EDANA ERT 460.2-02 is 0.68 g/mL or more,
• where the vertical liquid diffusion length (D) and the horizontal liquid diffusion length (L) are determined by filling a transparent container made of an acrylic resin (having internal dimensions of 40 mm in a vertical direction (height) by 72 mm in a horizontal direction (width) by 3 mm in depth) with the water-absorbing resin up to a position at a height of 30 mm, injecting, from a surface of the water-absorbing resin, 1 mL of a 0.9 mass % aqueous sodium chloride solution which is colored and has a temperature of 20° C., and measuring a diffusion length in the vertical direction and a diffusion length in the horizontal direction 1 minute after the injection