a filament connector for fastening a fishing hook or a swivel to a fishing line , or for fastening two fishing lines together , includes a body provided with an internal cavity connected to the exterior of the body by an aperture , a pair of walls of the cavity converged towards the aperture , a wedge member positioned and movable within the cavity has part surfaces facing the walls of the cavity , whereby a filament can be formed into a bight within the cavity , around the wedge member and out through the aperture so that tension in the filament pulls the wedge member towards the aperture , the filament becoming trapped between at least one of the walls and the adjacent part surface of the wedge member .