An absorbent article adapted to be worn on a body includes an absorbent article main body having a longitudinal direction, a width direction perpendicular thereto, and a thickness direction perpendicular thereto; and an absorbent body overlapping the absorbent article main body along the longitudinal direction. One end section in the longitudinal direction of the absorbent body is undetachably joined to the absorbent article main body, and another end section in the longitudinal direction of the absorbent body is detachably joined to the absorbent article main body. A section of the absorbent body on a wearer-facing side that is positioned on a body side in use and that does not oppose the absorbent article main body is easier to elongate in the width direction than a section of the absorbent body on an non-wearer-facing side that opposes the absorbent article main body.