The disclosure discloses a printer includes a main-body case, a housing portion configured to house substantially sheet-shaped media to be printed as a print object therein, a pickup roller configured to pick up and feed the medium to be printed toward a first direction along a surface direction of the medium, a platen roller configured to feed the medium to be printed, a print head configured to perform desired printing on the medium to be printed being fed, a paper guide configured to reverse the medium to be printed being fed toward a second direction in opposite to the first direction, the paper guide including at least one arc-shaped surface portion provided along the outer peripheral surface of the platen roller in an opposed manner thereto, and a coupling member that couples between the paper guide and a rotation shaft of the platen roller.