This optical-fiber holder comprises an annular optical-fiber winding framework. The optical-fiber winding framework includes an optical-fiber winding frame portion and a base portion provided as a turning axle of the optical-fiber winding framework. The optical-fiber winding frame portion has an optical-fiber containing groove formed along a periphery thereof. The base portion has an opening penetrating into an interior thereof and communicating with the optical-fiber containing groove at both ends. An optical fiber is wound and held in the interior of the base portion and the optical-fiber containing groove.