[Problem] To suppress contact of a cut surface of an optical fiber and a blade after cleavage of the optical fiber. [Solution] A fiber cutter of this disclosure includes: a base member that includes a fiber grip for gripping an optical fiber; a slide member that includes a fiber end grip for gripping an end portion of the optical fiber, the slide member being movable relative to the base member; a cut forming section that includes a blade for forming an initial cut in the optical fiber between the fiber grip and the fiber end grip; and a tension application section that applies force between the base member and the slide member to apply tension to the optical fiber gripped by the fiber grip and the fiber end grip. The cut forming section is provided to the slide member, and when the initial cut formed by the blade grows and the optical fiber cleaves, the cut forming section moves together with the slide member by the force of the tension application section.
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