An information media processing device may include a transport passage in which an information medium having MICR characters printed in a predetermined print position is transported, a magnetic head arranged in the transport passage, an image reading means arranged in the transport passage, a transporting means arranged in the transport passage, which has a shifting mechanism for shifting the information medium into an area in which the magnetic head can make magnetic detection, and a controller which detects the reference edge of the information medium based on the image read by the image reading means to judge if the print position is distanced by a predetermined amount or more from the magnetically-detectable area of the magnetic head based on the reference edge; when the print position is distanced by a predetermined amount or more, the transporting means shifts the information medium into the magnetically-detectable area while transporting the information medium.