Patent ID: 7153295

Claim:
A disposable diaper, comprising: a top sheet facing the wearer; a liquid impervious back sheet facing away from the wearer; a liquid absorbent core disposed between said top and back sheets; a front waist region; a back waist region; a crotch region which is positioned between said front and back waist regions; end flaps which are outside respective end edges of said core and extend in a transverse direction of said diaper therefrom; side flaps which are outside respective side edges of said core and extend in said longitudinal direction of said diaper therefrom; and openings which pass through a thickness of said top sheet and said core and are formed in at least said crotch region out of said front and back waist regions and said crotch region; wherein said back sheet has a free portion which is underneath said core and extendible downwards in a thickness direction of said diaper, and fixed edge portions which defines an outer periphery of said free portion and fixed to said top sheet; wherein, of said free portion and said fixed edge portion, at least said free portion is contractibly attached with a plurality of elastic members which are arranged in said transverse direction of said diaper at a given interval; and wherein a plurality of gathers extending in said transverse direction are formed under contraction of said elastic members.