Abstract: The medium detection unit is a component constituting an optical path of the detection light, and includes a first optical element disposed on an upper side of the medium transport path and a second optical element disposed on a lower side of the medium transport path so as to face the first optical element, the second optical element has a facing surface that faces the first optical element, the facing surface being located at a position that is not in contact with a medium nipped by both the first roller pair and the second roller pair, and a medium feeding direction by the first roller pair is a direction by which a leading edge of a medium fed out abuts a position upstream in the medium transport direction relative to a position where the detection light is received on the facing surface.