An absorbent article (1) includes: an absorbent main body (10) including an absorbent core (40)； and a pair of leak-proof walls (20). The pair of leak-proof walls are provided on respective widthwise side portions of the absorbent main body (10). Each of the leak-proof walls (20) is capable of standing on a skin side in the thickness direction, and includes a skin-side portion (23) and a non-skin-side portion (24). A joined part (27) is formed by joining at least partially a surface of the skin-side portion (23) and a surface of the non-skin-side portion (24), the surfaces facing to each other. The absorbent main body (10) includes a crotch stretchable portion (15) in a central portion in the width direction and the longitudinal direction, and the crotch stretchable portion (15) stretches/contracts in at least one direction of the longitudinal direction and the width direction. The joined part (27) is provided inside a distal end of the leak-proof wall (20) and outside the crotch stretchable portion (15) in the width direction. A part of the joined part and a part of the crotch stretchable portion at least overlap in the longitudinal direction.
