Provided is a coupling device for coupling optical fiber cables, wherein contact with the internal parts is reduced when coupling a connector, and the coupling is simplified. When a projection 1101 of a connector device housing is slid along a groove 1001 and is positioned at the deepest part of the groove 1001 during the insertion of the projection 1101 into an adapter device groove 1001 of an adapter device housing 601, the coupling device which connects optical fiber cables compresses an elastic member, and connects an optical fiber connector of the connector device and the optical fiber end on the adapter device side.
