A wire connection structure includes a ring-shaped magnetic body, a first wire having a first wire end portion which is inserted through the ring-shaped magnetic body from a first direction, a second wire having a second wire end portion which is inserted through the ring-shaped magnetic body from a second direction opposite to the first direction, and a conductive member which is disposed outside the ring-shaped magnetic body and has two end portions that are electrically connected to a conductor of the first wire end portion and a conductor of the second wire end portion respectively.

A wire connection structure includes a ring-shaped magnetic body, a first wire having a first wire end portion which is inserted through the ring-shaped magnetic body from a first direction, a second wire having a second wire end portion which is inserted through the ring-shaped magnetic body from a second direction opposite to the first direction, and a conductive member which is disposed outside the ring-shaped magnetic body and has two end portions that are electrically connected to a conductor of the first wire end portion and a conductor of the second wire end portion respectively.

A noise reduction cable includes an insulated wire including an insulator and a wire conductor, an outer circumference of which is coated with the insulator, a magnetic-material layer including a magnetic-material-containing member wound around an outer circumference of the insulated wire, a shield layer with which an outer circumference of the magnetic-material layer is coated, a magnetic-material-fixing-and-insulating tape layer that is disposed between the magnetic-material layer and the shield layer. The magnetic-material-fixing-and-insulating tape layer fixes the magnetic-material layer and insulates the magnetic-material layer and the shield layer from each other.

A communication cable 1 is provided with a conductor 2, an insulation layer 3 containing an organic polymer and covering an outer periphery of the conductor 2, a metal foil 5 for covering an outer periphery of the insulation layer 3, and a magnetic sheath layer 7 containing an organic polymer and a powdered magnetic material and covering an outer periphery of the metal foil 5. A tensile modulus of elasticity of the magnetic sheath layer 7 is lower than that of the insulation layer 3. Assuming that an organic polymer having a melting point of 100 C. or lower is a low melting point polymer and a mass ratio of the low melting point polymer to organic polymer components constituting each layer is a low melting point component ratio, the low melting point component ratio is larger in the magnetic sheath layer 7 than in the insulation layer 3.