Optical fiber fusion splicing method and fusion splicing device

An optical fiber fusion splicing method for performing fusion splicing through positioning of optical fibers to be spliced in a V-groove, the optical fiber fusion splicing method comprising:

• pressing the optical fibers placed in the V-groove relatively toward the V-groove using a clamp;
• in a state in which the optical fibers are pressed by the clamp, varying a clamp pressure of the clamp, by changing a position of the clamp in a direction intersecting an axial direction of the optical fibers;
• and
• moving the optical fibers placed in the V-groove with respect to the V-groove in the axial direction,
• wherein the varying the clamp pressure and the moving the optical fibers in the axial direction are performed simultaneously,
• the varying the clamp pressure includes raising and lowering the clamp pressure, and
• the moving the optical fibers includes moving the optical fibers forward and backward in the axial direction.