To apply a strong bend to a folding part of a paper sheet when the folding part passes through a roller nip, and to prevent the folding paper sheet from wrinkling.
A device for folding a paper sheet includes: supporting members for supporting each shaft of two rollers that are paired to perform folding to a common part; and pressurizing members for pressurizing the rollers in a direction of bringing the two rollers into contact with each other. The supporting members fixedly support one of the two rollers at a position while supporting the other of the two rollers so as to be displaceable so that the other roller can approach to and be separated from the one roller to regulate both the maximum value and minimum value of a space formed by both surfaces of the two rollers.
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