Connector with metal spring

The connector includes: an axial member that is a cylindrical conductor; a central contact disposed inside along a central axis of the axial member; an insulating member interposed between the axial member and the central contact and which holds the central contact; a first flange and a second flange provided on an outer peripheral surface of the axial member; and a metal spring provided along an outer peripheral surface of the axial member. The metal spring includes: a C-shaped metal spring body; curved parts; elastic pieces that extend from the curved parts so as to face an outer peripheral surface of the metal spring body; inner protrusions provided on an inner peripheral surface of the metal spring body so as to protrude inside the metal spring body; and outer protrusions provided on outer peripheral surfaces of the elastic pieces so as to protrude outside the elastic pieces.