Stretchable sheet, worn article using the same, and stretchable sheet manufacturing apparatus

A stretchable sheet comprising:

• a pair of sheets whose first surfaces oppose each other or are in contact with each other;
• a plurality of elastic members that are arranged between the first surfaces of the pair of sheets and are arranged spaced apart from each other;
• a plurality of attached portions, wherein the first surfaces of the pair of sheets are attached to each other by a welding construction without using an adhesive, at the attached portions;
• the attached portions hold the elastic members;
• the attached portions extend in a direction crossing a direction of stretch of the elastic members;
• and the attached portions are spaced apart from each other in the direction of stretch at positions where the attached portions cross the elastic members;
• and
• a plurality of folds that appear between the attached portions in a state where the elastic members are shrunk,
• wherein a width of the attached portions in the direction of stretch is set to be 0.2 mm or more and less than 1.0 mm,
• the folds are formed as the pair of sheets protrude, between the attached portions, with respect to a virtual plane that includes the elastic members;
• and
• in an area defined between adjacent attached portions of the attached portions and adjacent elastic members of the elastic members, non-bonded positions of the pair of sheets that oppose each other protrude in the same direction, thereby forming a fold of the folds.