[Problem] To enable wing-shaped flaps to be properly folded back at their correct folding positions (base positions) along the side edges of panties. [Solution] In napkin (1) having a wing-shaped flap (W, W) formed on both sides of the section of the main body where absorbent body (4) is interposed between liquid-permeable surface sheet (3) and liquid-impermeable backing sheet (2) wherein the flaps are each secured by wrapping around the crotch section of underwear when being attached, the wing-shaped flap (W) has front side profile line (10) that extends outwards from the main body section and rear side profile line (11) that extends outwards from the main body section, the front side profile line (10) is a wave-shaped line formed by a repetition of convex portions that protrude outwards and concave portions that protrude inwards, and straight line (L) connecting vertex (P) of concave portion (10c) positioned in the most outwards position and connecting point (Q) where rear side profile line (11) of the wing-shaped flap (W) connects to the main body section of napkin (1) is configured to be at an angle (±) of 60-65° in relation to a line, along the lateral direction of napkin (1), passing through the connecting point (Q).
