To efficiently and surely clean a rotating cylindrical solder paste printing plate while continuing rotation during the operation of a solder paste printer.

The solder paste printer 100 includes a solder paste printing plate 40, a feed roller 20, a solder paste feeder 48, a squeegee 45 and a cleaning unit 10. The cleaning unit 10 includes a delivery roller 11 for delivering a cleaning sheet 39, and a winding roller 12 for winding the cleaning sheet 39; and pressure rollers 51, 52 pressing a cleaning surface to a contact surface of the printing plate 40 with a flexible printed board 30 with predetermined pressing force. During the operation of the printer 100, the cleaning surface is brought into contact with the contact surface during the n-rotation of the printing plate 40 to eliminate residue of paste 49, and a used portion is wound by the winding roller 12 to deliver an unused portion from the delivery roller 11 during the m-rotation of the printing plate 40 to change the cleaning sheet 39, thus forming a new cleaning surface.