There is provided wiring device for optical fiber capable of increasing the performance of construction work. A cover 2 is disposed in an aperture formed at front surface of the plug receptacle main body 1, the upper end thereof is rotatably supported to the plug receptacle main body 1, and a receptacle 3 is attached to the rear surface side of the cover 2. The receptacle 3 has a plug connection hole facing an outer surface side of a building at least at a used state and a plug connection portion into which a first optical-fiber plug being attached to the optical fiber cable wired to the inside of the building is inserted and connected, and optically connects the first optical fiber being connected to the plug connection portion and a second optical-fiber plug inserted from the outer surface side of the building through the plug connection hole. A notch 14 for inserting the first optical-fiber plug is formed at a sidewall 11b of the plug receptacle main body 1 which is located in the inserting direction of the optical fiber plug inserted and connected to the plug connection portion.