A stretchable sheetincludes: a plurality of attached portionsspaced apart from each other in the direction of stretch, wherein the first surfacesandof a pair of sheetsandare attached to each other by being welded without using an adhesive, at the attached portions, the attached portionshold elastic members, and the attached portionsextend in a directioncrossing the direction of stretchof the elastic members； and a plurality of foldsthat appear between the attached portionswhile the elastic membersare shrunk, wherein a widthof the attached portionsin the direction of stretchis set to be 0.2 mm or more and less than 1.0 mm.
