It includes: a carrying step of carrying a continuous member of a combined web in a direction perpendicular to a girth direction Y; a first folding step of folding a girth portion 3, while performing the carrying step, so that a non-skin-contact surface 3b of the girth portion 3 lies on a non-skin-contact surface 3b of one of first and second side flaps; a second folding step of folding the first and second side flaps, while performing the carrying step and after the first folding step, so that skin-contact surfaces 3a of the first and second side flaps lie on skin-contact surfaces 3a of a back portion and a front portion; a cut-off step of cutting the continuous member into individual worn articles, after the second folding step; and a third folding step of folding the individual worn articles so that a first fastener member 31 provided on a skin-contact surface 3a of the girth portion 3 lies on a second fastener member 32 provided on a non-skin-contact surface 3b of the other one of the first and second side flaps.