A medium transportation apparatus includes a fixed member fixed to an apparatus main body, and a switching guide for guiding a medium. The switching guide is disposed to be freely rotatable relative to the apparatus main body, and to be freely switched between a first guiding position and a second guiding position. The switching guide includes a medium guiding portion and a first engaging portion integrally formed with the medium guiding portion. The fixed member includes a second engaging portion for engaging with the first engaging portion. When the switching guide is situated at the first guiding position, the first engaging portion engages with the second engaging portion.