An absorbent article 10 having an absorbent body 17 including a liquid permeable topsheet 15, a liquid impermeable leak-preventive sheet, and a liquid retentive absorbent member 16 and an exterior material 14 including a rear portion B, a front portion A, and a crotch portion C. The absorbent article 10 has both side edge portions 18b of the rear portion B and both side edge portions 18a of the front portion A joined via respective mechanical fasteners 12 to take on the shape of pants. The male member 19 is attached to the inner side of the side edge portion 18b of the rear portion B. The female member 20 is a strip-shaped sheet attached by its outer edge portion 20a to the inner side of the side edge portion 18a of the front portion A, with the portion inward of the outer edge portion 20a left free as a flap 20b. The male member 19 engages the flap 20b of the female member 20 to join each side edge portion 18b of the rear portion B and each side edge portion 18a of the front portion A.
