Winkles are prevented from being generated in the flap portion to reduce an uncomfortable feeling and friction. In a sanitary napkin 1 including an absorber 4 interposed between a liquid-permeable top sheet 3 and a liquid-impermeable back sheet 2 and a flap portion F surrounding the absorber 4 without including the absorber 4, the flap portions F at least in a front side area and a back side area of the sanitary napkin 1 each have an outer shape of a wave-like line 10 composed of convex curves 11 and 13 and concave curves 12 in which the direction of a line tangent to the outline of the flap portion F is continuously changed the width of the absorber 4 gradually narrows in each of the front side area and the back side area in such a manner that lines incline toward each other to form a convex curve and the wave-like line 10 is formed along each of the inclining line 4a.
