To provide a paper folding device capable of folding a predetermined section of a paper and a stapling device capable of binding predetermined sections of a plurality of paper with respect to various kinds of paper.

This paper folding device is provided with an information acquiring part 148 for acquiring paper information indicating kind of paper, a paper travel mechanism 141 having an end guide abutted on a lower fringe of a paper in a standing condition and movable in the vertical direction and moving the paper in the vertical direction by moving the end guide in the vertical direction, and a control part 147 adjusting travel amount of the end guide to let a blade that a bending mechanism 143 has abut on a predetermined section of the paper and adjusting to nip predetermined sections of papers on which driving ports of a stapler are overlapped.