CUTTING DEVICE OF OPTICAL FIBER AND CUTTING METHOD OF OPTICAL FIBER, AND BLADE MEMBER FOR CUTTING OPTICAL FIBER

An optical fiber cutting device and method, and optical fiber cutting blade member in which excellent workability is obtained by a simple configuration, and a cost reduction can be attained are provided. An optical fiber cutting device 10 includes: clamps 20U, 20L which clamp an optical fiber 11 at both axial sides of a to-be-cut portion to fix the optical fiber 11; a blade member 30 which presses a blade edge 31 against the to-be-cut portion of the optical fiber 11 clamped by the clamps 20U, 20L, to provide an initial flaw 11a; an updating mechanism 40 which updates the position of the blade member 30 so that, during a cutting operation, an unused portion of the blade edge 31 is contacted with the optical fiber 11; a pillow member 50 which presses the optical fiber 11 from the side opposite to the initial flaw 11a provided by the blade member 30, to apply a tensile bending force, thereby breaking the optical fiber 11; and a blade pressure setting spring 32 which urges the blade member 30 toward the optical fiber 11 by a predetermined elastic urging force.