A method for manufacturing a disposable worn article, including: severing a continuous web W along a cut-off line L1 having a predetermined wave shape, dividing the continuous web W into a first and second divided webs W1, W2； allowing the first and second divided webs W1, W2 to cross each other in a width direction X so as to reverse positions of the first and second divided webs W1, W2 in the width direction X； reversing the second divided web W2 by twisting the second divided web W2 by 180°； rotating a second side panel which is cut off from the second divided web W2 by 180°, thereby producing a second side panel PR in line symmetry with a first side panel PL which is cut off from the first divided web W1； and placing and fastening the side panels PL, PR to the side portions of the body 20.
