An absorbent article (1) includes a top sheet (10) a back sheet (20) an absorber (30) and a pair of side sheets (41) that cover the widthwise outer ends of the absorber. The widthwise inner ends (41A) of the side sheets are arranged between the absorber and the top sheet in the thickness direction. The pair of side sheets extends more outward in the widthwise direction than the top sheet and the absorber. The density of the side sheets is higher than the density of the top sheet.