An object of the present invention is to prevent a holding position of a sheet with respect to a suction holding member from changing during a movement of the suction holding member. A joining unit (8) includes: a suction holding member (33) having a suction surface (33d) configured to suction an end section of a sheet (W) of a standby-side roll (R2); a moving mechanism configured to move the suction surface (33d) toward an intermediate section of a sheet of a delivery-side original material roll (R1) along a path set in advance so that tension is applied to the sheet (W); and a regulating mechanism that is configured to switch between a regulated state in which a movement of the end section of the sheet with respect to the suction holding member (33) due to the tension is regulated and an allowable state in which the movement of the end section of the sheet (W) with respect to the suction holding member (33) is allowed. The controller (70) switches the regulating mechanism to the regulated state during the movement of the suction surface (33d) toward the intermediate section of the sheet (W) of the delivery-side original material roll (R1).