Absorbent article

An absorbent article having a crotch portion, a front side region on a front side of the crotch portion, and a back side region on a back side of the crotch portion,

• comprising:
• a front surface sheet configured to face a skin of a wearer;
• a back surface sheet located on a side opposite to the front surface sheet;
• and an attachment member which is formed in each of the front side region and the back side region of the back surface sheet, and by means of which the absorbent article can be removably attached to an inner surface of an outer article,
• wherein the attachment member is a hook member of a mechanical fastener,
• the hook member is formed of a sheet-like base portion and a plurality of hook portions,
• the hook portion has a support column extending from the base portion and a protruding portion at an end of the support column on the base portion,
• in each of the large number of hook portions located in the front side region,
• the protruding portion extends in a front-back direction, and a length of a front side of the protruding portion is longer than a length of a back side of the protruding portion, or
• the protruding portion extends to a front side in the front-back direction, and
• in each of the large number of hook portions located in the back side region,
• the protruding portion extends in the front-back direction, and a length of a back side of the protruding portion is longer than a length of a front side of the protruding portion, or
• the protruding portion extends to a back side in the front-back direction.