High frequency current feeding conductor

A power supply body for high-frequency current is comprised of a conductor and an insulating sheath covering the conductor. The conductor is formed as a single structure in which its one part is separated from the other part and at least one gap is formed therebetween in the cross section orthogonally crossing its longitudinal direction. The insulating sheath is a molded body of a synthetic resin, and the conductor is integrally molded in the insulating sheath.