A sensor for executing simple discrimination is provided on a transfer path immediately after a cash inlet of a cash depository. The sensor detects a position of a bill in a transfer direction, a width of the bill in a direction orthogonal to the transfer direction, thereby outputting detection results to a controller. The controller calculates a degree of a slant of the bill and the width of the bill, thereby determining whether or not those values are in excess of reference values. If the controller determines that the degree of the slant and the width of the bill are in excess of the reference values, the transfer direction of the transfer path is changed over to coincide with a direction opposite to a normal direction by reverse-rotating a motor.