A shorts type disposable diaper having a leg opening portion where a leg elastic member is formed, the leg elastic member including a first elastic member 71A through 71C which is arranged from the stomach side portion side to the under-crotch portion and a second elastic member 72A through 72C which is arranged from the back side portion side to the under-crotch portion, respective extension portions 71b, 72b of the first and second elastic members extending from a portion for forming the leg elastic region towards the widthwise center of the diaper including end portions 71c, 72c, which do not exhibit elastic contractibility, at a location where the extension portions do not reach the widthwise center of the diaper, one elastic member 71 and the other elastic member 72 being overlapped one upon the other at the extension portions 71b, 72b.
