The present invention relates to a sheet processing apparatus, such as a banknote processing apparatus. The banknote processing apparatus has a receiving portion into which banknotes are inserted, a take-out roller for taking out banknotes from the receiving portion, a detector for discriminating 'regular and defective' and 'front and back' of taken-out banknotes, and first to fourth stacking and banding devices for classifying and stacking banknotes on the basis of discrimination results and banding each 100 banknotes. When the first stacking and banding device fails in a mode that the first and second stacking and banding devices stack front bills and the third and fourth stacking and banding devices stack back bills, in expectation of 100 front bills being stacked in the second stacking and banding device, in the timing that the 97th front bill passes the detector, the take-out roller is stopped. When the number of front bills is less than 100, the take-out roller rotates and takes out one banknote. |