A paper feeder includes a plurality of paper feeding units that feeds a recording medium from a paper feeding tray, has a first guiding surface towards a paper transporting path that guides the recording medium, and is arranged along a direction of transporting the recording medium, and a transporting guide that has a second guiding surface towards the paper transporting path between the paper feeding units. The transporting guide is arranged in such a manner that the second guiding surface is overlapped with the first guiding surface of at least one of the paper feeding units adjacent to the transporting guide on either of an upstream side and a downstream side in the direction of transporting the recording medium.