A sorter is provided, which has: a transfer direction switching section for selectively switching a transfer direction of a conveyed paper sheet between first or second transfer directions; a first paper transfer section for transferring the paper sheet in the first transfer direction selected by the transfer direction switching section; a second paper transfer section for transferring the paper sheet in the second transfer direction selected by the transfer direction switching section; a nonsort/storage section for sorting and storing the paper sheet transferred by the first paper transfer section; a sort/storage section for sorting and storing the paper sheet transferred by the second paper transfer section; and a paper transfer/drive section for interrupting the second paper transfer section so as to perform nonsort/storage operation by driving only the first paper transfer section when the paper sheet to be sorted is jammed.

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