In the absorbent article 1 according to the present invention, each groove 10 of the pair of grooves in a central region in the longitudinal direction L has a first section 3A which is formed so as to be curved in a convex manner at an inside of a widthwise direction W of the absorption layer a second section 3B and a third section 3C which is linked with each end of the first section 3A and is formed so as to be curved in a convex manner at an outside of the widthwise direction. A radius of curvature of the first section 3A is smaller than a respective one of a radius of curvature of the second section 3B and a radius of curvature of the third section 3C, and a virtual line V1 which connects a side surface 13B2 which is opposite to a side surface 13B1, 13C1 which forms an outermost part in the widthwise direction W in the second section 3B and a side face 13C2 which forms an outermost part in the widthwise direction W in the third section 3C, the virtual line V1 is adapted so as to be positioned at an outside of the widthwise direction W more than a side surface 13A2 which is opposite to a side surface 13A1 which forms an innermost part in the widthwise direction W in the first section 3A.
