An absorbent article with a topsheet and a backsheet surrounding an absorbent core has been patented. The article features leakage-preventing side walls on a liquid-receiving side. The leakage-preventing side walls extend in a longitudinal direction and lie opposite one another in the width direction of the article. At least a liquid-receiving face of each leakage-preventing side wall is made of a fibrous sheet that contains hydrophobic fibers thermally bonded to one another and hydrophilic fibers shorter than the hydrophobic fibers. At least a part of the hydrophilic fibers form aggregates that are dispersed in the fibrous sheet and are bonded to the hydrophobic fibers.