A DISPOSABLE DIAPER (1) COMPRISES A WORN ARTICLE BODY (2), AND A PAIR OF FIXING MEMBERS (40) WHICH ARE JOINED AT BOTH END PARTS OF THE COVERING ARTICLE MAIN BODY IN THE WIDTH DIRECTION. THE WORN ARTICLE BODY IS FOLDED BACK TOWARD THE INTERIOR IN THE WIDTH DIRECTION WITH A PAIR OF REFERENCE FOLDING LINES (FL1) BEING BASE POINTS, SAID PAIR OF REFERENCE FOLDING LINES (FL1) BEING LOCATED FURTHER IN THE INTERIOR IN THE WIDTH DIRECTION THAN JOINING UNITS (44) AT WHICH THE COVERING ARTICLE MAIN BODY AND THE FIXING MEMBERS ARE JOINED. THE REFERENCE FOLDING LINES ARE FORMED ONLY IN THE WORN ARTICLE BODY WITHOUT BEING FORMED IN THE FIXING MEMBERS. FIG. 1