A fusion-splicing device, including a fusion-splicing operation element that fuses ends of opposing optical fiber segments to form a spliced optical fiber; a ferrule holding device that receives and holds a ferrule holder in a predetermined position, the ferrule holder having an open end that receives a ferrule therein and an opposite end from which a string-like stem extends. The ferrule having an optical fiber segment that extends away from the open end of the ferrule holder when the ferrule is disposed in the ferrule holder, one end of the ferrule holding device being open to allow an end of the optical fiber segment of the ferrule to be held at a position to be fused to an end of an opposing optical fiber, and an opposite end of the ferrule holding device being shaped to accommodate the stem.