Absorbent article

An absorbent article comprising an absorbent assembly including a topsheet, a backsheet, and an absorbent core interposed between the topsheet and the backsheet, the absorbent article having an article longitudinal direction extending from a front region to be arranged on a front side of a wearer toward a rear region to be arranged on a rear side of the wearer, and an article lateral direction orthogonal to the article longitudinal direction, wherein:

• the absorbent core is formed of a sheet-like article including a plurality of absorbent units, each of the plurality of absorbent units including
• a long base portion having a lateral direction, a longitudinal direction that is longer than the lateral direction, and a thickness direction, and
• water-absorbent polymer particles that are fixed to a surface of at least one face of the long base portion,
• the absorbent units being arranged such that the absorbent unit's longitudinal direction is oriented in the article longitudinal direction;
• the sheet-like article includes a plurality of unit portions arranged in the longitudinal direction, each of the plurality of unit portions including a plurality of the absorbent units arranged side by side in the lateral direction;
• the sheet-like article includes
• a pair of longitudinal joined regions extending in the longitudinal direction at respective lateral sides which are along the longitudinal direction,
• a pair of lateral joined regions extending in the lateral direction at respective end portions in the longitudinal direction, and
• an intermediate lateral joined region extending in the lateral direction between the lateral joined regions;
• and
• the sheet-like article is joined at the longitudinal joined regions, the lateral joined regions, and the intermediate lateral joined region to a constituent member that constitutes the absorbent article and that is adjacent on at least either an upper side or a lower side in the thickness direction, and each of the unit portions includes a section in which neither the upper side nor the lower side thereof in the thickness direction is joined to the constituent member.