A processing device for a medium may include magnetic heads which face a medium transport channel from a lower side, magnetic heads which face the medium transport channel from an upper side, pad rollers which are disposed so as to face each of the magnetic heads, a movement mechanism for evacuating pad rollers from the medium transport channel, and a movement mechanism for evacuating pad rollers from the medium transport channel. In the transport direction for the recording medium, the magnetic head and the magnetic head are offset from each other, and the distance between the magnetic head and the magnetic head in the direction is shorter than the length of the range for recording of magnetic data recorded upon a magnetic stripe of the recording medium.