To provide a paper sheet processor for improving security and operability by using a multi-cassette which can be commonly shared by the extraction device, accumulation device or locking device of a paper sheet processor.

In a multi-cassette 12, a door 124b, a door 122a, a backup plate 123 and its slip stop mechanism and a spring 125 are installed in a main body 12a. Also, a first key switch 126a and a second key switch 126b are installed in a supply stand 11. Those key switches 126a and 126b are turned off so that the lock of the door 124b and the door 122a and the slip mechanism can be released. When processing starts, the door 124b opens, and the backup plate 123 and a paper sheet P are pulled by the spring 125 to an outlet 122b side, and the paper sheet P is pressurized to an extraction roller 30 side, and when the extraction roller 30 rotates, the paper sheet P is extracted one by one each time the extraction roller 30 rotates.

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