A paper cutter comprising a pair of four-joint link array mechanisms (33, 33) disposed in parallel between a paper holding member (31) and a base (20), wherein pivotal links (33a, 33b) adjacent between the respective four-joint link array mechanisms (33) are disposed to intersect with each other and to be slanted in directions opposite each other; in association with pivotal movements of the pivotal links (33a, 33b), connecting links (33c) move in opposition to each other in a longitudinal direction; a downward operation force of the paper holding member (31) acts as a pulling force on the respective connecting links (33c); vertical movement of the paper holding member (31) is constantly maintained in a parallel state with respect to the base (20); and a substantially uniform pressing force is imparted in a longitudinal direction of the paper holding member (31) in cooperation with the vertical movement of the paper holding member (31).