PROBLEM TO BE SOLVED: To provide an absorbent article to be fixed for use on an underwear and capable of being peeled sanitarily and easily after use from the underwear.SOLUTION: A groove 6 includes: a transverse groove 61 having a salient positioned on one end side A in the longitudinal direction of a body 5 and protruding in a top plan view toward the other end side B in the longitudinal direction of the body and a pair of longitudinal grooves 62 and 62 facing each other through said transverse groove 61 and extending in a longitudinal direction X. The transverse groove 61 is formed symmetrically across a longitudinal center line Lx halving the body 5 in a transverse direction Y. One longitudinal end portion Az of the body 5 has a width reducing portion 10, in which the length of said longitudinal one end portion Az in the transverse direction Y is gradually decreased from the inside to the outside of the longitudinal direction X. There are satisfied a relation of a length a1>a length a2 and a relation of a length b1
