A paper processing apparatus equipped with a paper transferor for sequentially transferring paper sheets while maintaining a predetermined interval between a certain paper sheet and the next paper sheet; a paper position detector for detecting the position of a paper sheet; a plurality of processors for performing processing for the paper sheet; an information reader for reading information relating to processing to be performed for the paper sheet; and a controller for controlling operations relating to the paper transferor, the paper position detector, the plurality of processors, and the information reader, wherein upon judging that the certain paper sheet has passed through a certain processor, the controller carries out control to adjust the widthwise position of the certain processor so as to be adapted for the processing for the next paper sheet.