A method for producing a wearing article which comprises a main body adapted to extend from a front abdominal region to a rear dorsal region via a crotch region of a wearer, and a side panel for covering a lateral surface of a waist region of the wearer by using a first suction-holding section having a first suction-holding surface capable of suction-holding a forward surface of the main body, and a second suction-holding section having a second suction-holding surface capable of suction-holding a rearward surface of the main body, the method comprising: a developed module preparing step of preparing a developed module which comprises the main body, and at least two side panel segments (3,3,4,4) extending from at least one of front and rear end portions of the main body, laterally in respective opposite directions; a suction-holding section positioning step of positioning the first suction-holding section and the second suction-holding section in such a manner that the first suction-holding surface and the second suction-holding surface are aligned side-by-side while facing a same side; a suction-holding step of, after the suction-holding section positioning step, suction-holding the forward surface of the main body in the developed module by the first suction-holding surface, and suction-holding the rearward surface of the main body in the developed module by the second suction-holding surface; a half-folding step of, after the suction-holding step, closing the first suction-holding section and the second suction-holding section in such a manner that the first suction-holding surface and the second suction-holding surface face each other, thereby folding the main body in half; and a temporarily joining step of externally heating and/or pressing superimposed portions of the developed module half-folded by the half-folding step, thereby releasably joining the superimposed portions of the developed module so that a wearer can wear the wearing article by releasing the joined state of the temporarily joined areas; wherein, in the temporarily joining step, a temporarily joining portion provided in at least one of the first suction-holding section and the second suction-holding section is brought into contact with the superimposed portions of the developed module during a period of performing the half-folding step, thereby releasably joining the superimposed portions of the developed module; wherein the temporarily joining portion comprises a protruding element protruding from at least one of the first suction-holding surface and the second suction-holding surface, and wherein, in the temporarily joining step, the superimposed portions of the developed module are compressed between the protruding element and a counterpart suction-holding section by closing the first suction-holding section and the second suction-holding section in the half-folding step, thereby the main body is folded in half while releasably joining the superimposed portions of the developed module. a developed module preparing step of preparing a developed module which comprises the main body, and at least two side panel segments (3,3,4,4) extending from at least one of front and rear end portions of the main body, laterally in respective opposite directions; a suction-holding section positioning step of positioning the first suction-holding section and the second suction-holding section in such a manner that the first suction-holding surface and the second suction-holding surface are aligned side-by-side while facing a same side; a suction-holding step of, after the suction-holding section positioning step, suction-holding the forward surface of the main body in the developed module by the first suction-holding surface, and suction-holding the rearward surface of the main body in the developed module by the second suction-holding surface; a half-folding step of, after the suction-holding step, closing the first suction-holding section and the second suction-holding section in such a manner that the first suction-holding surface and the second suction-holding surface face each other, thereby folding the main body in half; and a temporarily joining step of externally heating and/or pressing superimposed portions of the developed module half-folded by the half-folding step, thereby releasably joining the superimposed portions of the developed module so that a wearer can wear the wearing article by releasing the joined state of the temporarily joined areas; wherein, in the temporarily joining step, a temporarily joining portion provided in at least one of the first suction-holding section and the second suction-holding section is brought into contact with the superimposed portions of the developed module during a period of performing the half-folding step, thereby releasably joining the superimposed portions of the developed module; wherein the temporarily joining portion comprises a protruding element protruding from at least one of the first suction-holding surface and the second suction-holding surface, and wherein, in the temporarily joining step, the superimposed portions of the developed module are compressed between the protruding element and a counterpart suction-holding section by closing the first suction-holding section and the second suction-holding section in the half-folding step, thereby the main body is folded in half while releasably joining the superimposed portions of the developed module.