PURPOSE: To enable a single sensor to easily detect a bankbook to be set in a correct position and angle, by moving the bankbook in a fixed distance to be checked two times.

CONSTITUTION: When a bankbook 10 is set tilting in the clockwise direction, the bankbook 10 is not paper set because no set of the bankbook is detected by a sensor 8 due to a clearance between the bankbook and a guide 9. Next the bankbook 10, when it is set tilting in the counterclockwise direction, is attracted by a roller 7 through the sensor 8 detecting the bankbook to be set, but if the bankbook, after it is attracted in a fixed distance as shown by a broken line in the drawing, is again checked by the sensor 8, a mechanism, being placed in a condition of no bankbook, enables the tilting to be detected and discharges the bankbook by a roller 11. In this way, the mechanism can be substantially simplified with only one sensor, detecting existence of the bankbook, by eliminating the necessity for the other mechanism.