An absorbent article comprising: an absorbent main body including an absorbent core and having a longitudinal direction, a width direction, and a thickness direction that intersect one another, the absorbent main body including a crotch stretchable portion in a central portion in the width direction and the longitudinal direction, the crotch stretchable portion being capable of stretching and contracting in at least one direction of the longitudinal direction and the width direction; a pair of leak-proof walls provided on respective widthwise side portions of the absorbent main body, each of the leak-proof walls including an elastic member that stretches and contracts in the longitudinal direction, each of the leak-proof walls being capable of standing on a skin side in the thickness direction, each of the leak-proof walls including a skin-side portion and a non-skin-side portion, the non-skin-side portion disposed on a non-skin side in the thickness direction with respect to the skin-side portion; and a joined part provided inside a distal end of the leak-proof wall and outside the crotch stretchable portion in the width direction, the joined part formed by joining at least partially a surface of the skin-side portion and a surface of the non-skin-side portion, the surfaces facing to each other, a part of the joined part and a part of the crotch stretchable portion at least overlapping in the longitudinal direction; wherein the absorbent article further comprises an exterior body including a front waist portion located on one end side of the absorbent main body and a back waist portion located on another end side of the absorbent main body, and at least one end portion of the joined part overlaps in the longitudinal direction a bonding region where the exterior body and the absorbent main body are bonded. an absorbent main body including an absorbent core and having a longitudinal direction, a width direction, and a thickness direction that intersect one another, the absorbent main body including a crotch stretchable portion in a central portion in the width direction and the longitudinal direction, the crotch stretchable portion being capable of stretching and contracting in at least one direction of the longitudinal direction and the width direction; a pair of leak-proof walls provided on respective widthwise side portions of the absorbent main body, each of the leak-proof walls including an elastic member that stretches and contracts in the longitudinal direction, each of the leak-proof walls being capable of standing on a skin side in the thickness direction, each of the leak-proof walls including a skin-side portion and a non-skin-side portion, the non-skin-side portion disposed on a non-skin side in the thickness direction with respect to the skin-side portion; and each of the leak-proof walls including an elastic member that stretches and contracts in the longitudinal direction, each of the leak-proof walls being capable of standing on a skin side in the thickness direction, each of the leak-proof walls including a skin-side portion and a non-skin-side portion, the non-skin-side portion disposed on a non-skin side in the thickness direction with respect to the skin-side portion; and a joined part provided inside a distal end of the leak-proof wall and outside the crotch stretchable portion in the width direction, the joined part formed by joining at least partially a surface of the skin-side portion and a surface of the non-skin-side portion, the surfaces facing to each other, a part of the joined part and a part of the crotch stretchable portion at least overlapping in the longitudinal direction; wherein the joined part formed by joining at least partially a surface of the skin-side portion and a surface of the non-skin-side portion, the surfaces facing to each other, a part of the joined part and a part of the crotch stretchable portion at least overlapping in the longitudinal direction; wherein the absorbent article further comprises an exterior body including a front waist portion located on one end side of the absorbent main body and a back waist portion located on another end side of the absorbent main body, and a front waist portion located on one end side of the absorbent main body and a back waist portion located on another end side of the absorbent main body, and at least one end portion of the joined part overlaps in the longitudinal direction a bonding region where the exterior body and the absorbent main body are bonded.