Absorbent article

An absorbent article comprising:

• a main body including a support sheet, a liquid absorbing layer laid on said support sheet, and a liquid-permeable sheet provided on a liquid receiving side of the main body and covering said liquid absorbing layer;
• and
• leakage preventing side walls provided on two sides of said main body lying opposite one another in a widthwise direction and extending in a longitudinal direction, to have root ends jointed to the surface of said liquid receiving side and to have free ends positioned apart from the surface of said liquid receiving side,
• wherein each leakage preventing side wall includes:
• a nonwoven fabric comprising thermoplastic fibers;
• and two elastic members for exhibiting an elastic shrinking force in the longitudinal direction,
• wherein said nonwoven fabric is provided with:
• at least two rigid regions having corrugations, ridges and valleys of which are individually extended in a direction from the root end to the free end of said leakage preventing side wall and are repeated regularly in the longitudinal direction;
• and a rigid boundary portion in which said corrugations are discontinuous and which is extended in the longitudinal direction midway between the root end and the free end of said leakage preventing side wall;
• wherein said two elastic members are respectively attached to said free end and a vicinity of said rigid boundary portion, and
• wherein the elastic member at said free end has a higher elastic shrinking force than that of the elastic member in the vicinity of said rigid boundary portion.