An absorbent article includes an absorbent main body； a stomach-side member at an end portion on one side of the absorbent main body； and a back-side member at an end portion on another side. The absorbent main body has a pair of leak-proof walls in respective side end portions. Each of the leak-proof walls has a skin-side portion that includes a plurality of elastic members and a non-skin-side portion. The pair of leak-proof walls each have a joining portion in which mutually opposing surfaces of the skin-side portion and the non-skin-side portion are joined, and a non-joining portion above the joining portion. The mutually opposing surfaces are not joined in the non-joining portion. The joining portions are inward, with respect to the width direction, of leading ends of the leak-proof walls. Each of the joining portions is overlapped with the stomach-side member or the back-side member in an up-down direction.
