A printer is provided that can convey recording paper at a constant transportation speed and transportation amount passed a printing position by means of the transportation force of a single transportation roller pair located on the upstream side of the printing position.A roll paper printer has a vacuum type platen member opposite the ink nozzle surface of an inkjet head, and an upstream guide surface and a platen surface that defines the printing position are formed on the guide surface of the platen member. The upstream guide surface extends to a position near the nipping part of the single transportation roller pair on its upstream side. Because the recording paper fed from the nipping part toward the printing position is guided while being constrained by air suction to the upstream guide surface, deflection in the out-of-plane direction is suppressed and the recording paper is held flat. The recording paper can be conveyed with good precision to the printing position using only the transportation force of the single transportation roller pair disposed on the upstream side.