A disposable diaper (1) of pants type has front and rear bodies (5, 6) bonded to each other by a series of welded zones (10) along transversely opposite sides of front and rear waist sections. The welded zones (10) are at least partially defined by patterns of V-shape or patterns of V-shape being devoid of a sharp point, both laid down transversely of the diaper, or patterns of an arc opening transversely of the diaper. <IMAGE>
