COAXIAL CABLE

To provide a coaxial cable which has less constraints in a specification or a process while having high electric characteristics.SOLUTION: A coaxial cable includes a center conductor extending in a first direction, a first dielectric layer which contains a porous insulation material and is formed on the center conductor, a second dielectric layer which contains a solid insulation material and is formed on the first dielectric layer, an external conductor which contains a metallic foil and is formed on the second dielectric layer, and a jacket which contains an insulating resin material and is formed on the external conductor. In the coaxial cable, when in a cross section vertical in the first direction, an area of a region between an inner peripheral side interface of the second dielectric layer and an outer peripheral side interface of the internal conductor is stipulated as a first area, and an area of a region between the inner peripheral side interface of the second dielectric layer and an outer peripheral side interface of the second dielectric layer is stipulated as a second area, the second area is larger than the first area.SELECTED DRAWING: Figure 2 【課題】高い電気特性を備えつつ、仕様または工程上の制約が少ない同軸ケーブルを提供する。【解決手段】第一の方向に延在する中心導体と、多孔質絶縁材料を含み前記中心導体上に形成された第一誘電体層と、充実絶縁材料を含み前記第一誘電体層上に形成された第二誘電体層と、金属箔を含み前記第二誘電体層上に形成された外部導体と、絶縁性の樹脂材料を含み前記外部導体上に形成された外被と、を備えた同軸ケーブルであって、前記同軸ケーブルは、前記第一の方向に垂直な断面において、前記第二誘電体層の内周側界面と前記内部導体の外周側界面との間の領域の面積を第一面積、前記第二誘電体層の内周側界面と前記第二誘電体層の外周側界面との間の領域の面積を第二面積と規定したとき、前記第二面積が前記第一面積より大きい。【選択図】図２