Included are a supplying step of transferring and supplying a continuous sheet (3a) to a processing section (L3aK) by transporting the sheet (3a) in a direction of transport that conforms to a continuous direction in which the sheet (3a) continues； a processing step of performing processing onto portions of the sheet (3a) at intervals in the direction of transport, at a processing position (P3a) in the direction of transport, using a processing device (34) in the processing section (L3aK), the portions each corresponding to an absorbent article 1； a position adjusting step of adjusting, in a CD direction, a position of an end portion (3ae) in the CD direction in the sheet (3a), the CD direction intersecting the direction of transport in the sheet (3a), the position adjusting step being performed at an adjustment processing position (P35) in the direction of transport； and a detecting step of detecting a trace of the processing left on the sheet (3a), at a detection processing position (P36) downstream in the direction of transport from the processing position (P3a) and the adjustment processing position (P35), and outputting a detection result. The supplying step includes adjusting, based on the detection result, a tension in the direction of transport of the sheet (3a) at a time of being transferred to the processing section (L3aK).
