A coaxial cable includes a central conductor, a fluororesin insulation, and outer conductor and a jacket covering the outer conductor. The central conductor has three single element twisted wires. The central conductor has an outer diameter and the three single element twisted wires having a predetermined twist pitch. The fluororesin insulation covers the central conductor such that all of the twisted single element wires of the central conductor contact the fluororesin insulation. The fluororesin insulation is a non-foam insulation material. A series of voids are defined between portions of the central conductor and an inner surface of the fluororesin insulation. The outer conductor is disposed on the external periphery of the insulation. The adhesive force between the central conductor and the insulation, and a breaking strength of the central conductor have the following relationship: adhesive force≦⅓ breaking strength.