Winkles are prevented from being generated in the flap portion to reduce an uncomfortable feeling and friction. In a sanitary napkin including an absorber interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet and a flap portion surrounding the absorber without including the absorber, the flap portions at least in a front area and a back area of the sanitary napkin each have an outer shape of a wave-like line composed of convex curves and concave curves in which the direction of a line tangent to the outline of the flap portion is continuously changed the width of the absorber 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 is formed along each of the inclining lines.
