PURPOSE: To perform the transaction processing of paper money with high reliability by driving a paper sheets pulling back means, sending back delivered paper sheets and pulling the paper sheets back to a storage part when a paper sheets monitoring means detects the delivery abnormal element of paper sheets.

CONSTITUTION: On the lower part of a paper money accumulation part 13, a delivery torque detection sensor 81, a running state detection sensor S2, a thickness detection sensor S3, a reflective detection sensor S4 and a water content detection sensor S5 are arranged. If at least one of the detection sensors S1 to S3 detects an abnormality, a CPU immediately stops the drivings of a pickup roller 15 and a feed roller 16 and performs a pull-back operation. At the time of this pull-back, the CPU performs a pull-back processing for the abnormal paper money by together saving the paper money left in the paper money accumulation part 13 to the upper part and inversely rotating the pickup roller 15 and the feed roller 16 in a state that pull-back space is formed on the lower part of the paper money accumulation part 13. At this time, the pull-back is smoothly performed by the pulling back space secured in the paper money accumulation part 13.