A coaxial connector, the coaxial connector comprising a plug in which a socket is fitted at one end of the plug, wherein the plug includes: a shell that is made of a conductive material and has an insulator housing open to the one end; an outer conductor that is made of a conductive material and is held inside the insulator housing; a central conductor that is made of a conductive material and is located inside the shell; a movable insulator that is fitted in the central conductor so as to be slidable with respect to the central conductor and is housed in the insulator housing so as to be movable in an axial direction; and a biasing rubber member that is interposed between a partition disposed in the recesses of the insulator housing and the movable insulator or between a fixed insulator fixed in the shell and the movable insulator, the biasing rubber member including a pair of bearing plate s that are opposite to each other with a space in between, and a plurality of elastic pillars that connect between both the bearing plate s, and when the socket is connected to the plug, the movable insulator is pushed in by a pushing force from the socket, so that the elastic pillars are bent in an arc shape. the plug includes: a shell that is made of a conductive material and has an insulator housing open to the one end; an outer conductor that is made of a conductive material and is held inside the insulator housing; a central conductor that is made of a conductive material and is located inside the shell; a movable insulator that is fitted in the central conductor so as to be slidable with respect to the central conductor and is housed in the insulator housing so as to be movable in an axial direction; and a biasing rubber member that is interposed between a partition disposed in the recesses of the insulator housing and the movable insulator or between a fixed insulator fixed in the shell and the movable insulator, the biasing rubber member including a pair of bearing plate s that are opposite to each other with a space in between, and a plurality of elastic pillars that connect between both the bearing plate s, and a shell that is made of a conductive material and has an insulator housing open to the one end; an outer conductor that is made of a conductive material and is held inside the insulator housing; a central conductor that is made of a conductive material and is located inside the shell; a movable insulator that is fitted in the central conductor so as to be slidable with respect to the central conductor and is housed in the insulator housing so as to be movable in an axial direction; and a biasing rubber member that is interposed between a partition disposed in the recesses of the insulator housing and the movable insulator or between a fixed insulator fixed in the shell and the movable insulator, the biasing rubber member including a pair of bearing plate s that are opposite to each other with a space in between, and a plurality of elastic pillars that connect between both the bearing plate s, and when the socket is connected to the plug, the movable insulator is pushed in by a pushing force from the socket, so that the elastic pillars are bent in an arc shape.