A recording paper transportation path structure suppresses sagging of the recording paper fed from the nipping part of a pair of rollers to the platen surface of a vacuum platen, and can prevent a drop in paper feed precision. In a roll paper printer 1, the recording paper fed through the nipping part 52 of a paper feed roller 22 and a paper pressure roller 23 is fed along the contact plane P2 of the outside surface of the rollers 22 and 23 toward the platen surface 8a of the vacuum platen 8 at a slightly lower position. An inclined surface part 12b that slopes along the contact plane P2, an up-lifting surface part 12c that slopes down, and a protruding surface part 12d are formed contiguously to the upstream side at the upstream end part 8b of the platen surface 8a. Because the part of the recording medium 10 fed from the nipping part 52 is supported and guided by these parts, the paper is guided to the horizontal surface 12a of the platen surface 8a without drooping down, and a drop in paper feed precision and paper jams caused by the recording paper sagging can be avoided.