To provide a coupling device for a conducting wire with which connectors can easily be removed from adapters without a dedicated fixture even when the adapters are placed with high density in a narrow area.

First and second supporting members 33 and 34 in an optical fiber coupling part are hinged to a fixing member 37 by a common shaft 38. Accordingly, the first and second supporting members 33 and 34 can move between the position where the adapter 31 supported by the first supporting member and the adapter 31 supported by the second supporting member are alternatively placed and aligned, and the position where the adapter 31 supported by the first supporting member and the adapter 31 supported by the second supporting member are separated.