A medium carrying device that carries a medium includes a first roller, a second roller, a rotation transmitting part that drives its rotation by a driving force transmitted from a driving force source, and moves between at a transmitting position and at a releasing position, at the transmitting position, the rotation transmitting part transmits the driving force to the first roller, at the releasing position, the rotation transmitting part does not transmit the driving force, a transmission releasing part that is connected to the rotation transmitting part. When the medium is bowed between the first and second rollers, the transmission releasing part moves the rotation transmitting part from the transmitting position to the releasing position according to the bowing of the medium.