Elastic member and disposable wearing article including elastic member

An underpants-type disposable wearing article having an elastic member comprising:

• an integrated outer member covering from a front body to a back body or outer members separately provided for the front body and the back body;
• an inner member attached to an intermediate portion of the outer member in a width direction to extend to both front and back sides of a crotch portion;
• side seal portions in which both side portions of the outer member in the front body and both side portions of the outer member in the back body are bonded to each other;
• and
• a waist opening and a pair of right and left leg openings,
• wherein the elastic member has an elastic sheet stretchable structure in which an elastic sheet is interposed between a first sheet layer having air permeability and a second sheet layer having air permeability and the first sheet layer and the second sheet layer are bonded through joint holes penetrating the elastic sheet or through the elastic sheet at a plurality of sheet joined portions arranged at intervals,
• an elastic region having the elastic sheet stretchable structure is allowed to be stretched and contracted in a stretchable direction by a stretching force of the elastic sheet,
• the joined portions are arranged at intervals along an alignment direction intersecting the stretchable direction to form a plurality of joint portion rows comprising at least a first joined portion row, a second joined portion row, and a third joined portion row,
• the plurality of the joined portion rows is formed at intervals in the stretchable direction,
• only the third joined portion row is formed between the first joined portion row and the second joined portion row adjacent to each other,
• an interval between the joined portions of at least a part of the third joined portion row in the alignment direction is longer than intervals in the alignment direction between the joined portions of the first joined portion row and the second joined portion row on both sides of the third joined portion row,
• a ventilation path is continuous along the first joined portion row and the second joined portion row between the contraction wrinkles adjacent to each other in the direction orthogonal to the alignment direction, and
• the outer member in at least one of the front body and the back body is provided with the elastic member over a range in the width direction corresponding to a space between the side seal portions at least in a partial range in a front-back direction so that a stretchable direction thereof corresponds to the width direction.