To provide an absorbent article or the like including an absorbent body with a large absorption capacity and that is easy to place in the buttocks or the like. An absorbent article that is worn on a body and used 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 included by overlapping with the absorbent article main body along the longitudinal direction, wherein 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 and a section of the absorbent body on a non-opposing 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 opposing side that opposes the absorbent article main body.
