A connector includes a signal terminal, an insulating member, a ground terminal and an enclosure. The signal terminal has a main body extending in one direction, and a contact arm provided on each side of the main body for contacting another conductor. The insulating member encloses the main body. The ground terminal has a cylindrical main body enclosing the insulating member, and a contact arm provided on each side of the cylindrical main body for contacting another conductor. The cylindrical main body includes first and second semi-cylindrical parts, each having semi cylindrical shapes. The semi-cylindrical parts make a cylindrical shape as a whole by both end parts of the circumferential direction being assembled so as to mutually overlap. An insertion hole is formed in the enclosure where an assembly of the signal element, the insulating member and the ground terminal are inserted.