Communication cable and wire harness using same

A communication cable, comprising:

• an insulation electric wire including a conductor having tensile strength of 400 MPa or more and a cross-sectional area of 0.22 mm2 or less and a covering layer covering the conductor and being formed of an insulating material;
• and
• a sheath covering an outer periphery of the insulation electric wire and being formed of a resin composition containing crystalline polyolefin, wherein
• the insulating material contains polypropylene and a flexible resin, and a content rate of the polypropylene with respect to a total of the polypropylene and the flexible resin is 51 mass % or more and 85 mass % or less,
• the insulating material contains 15 to 60 parts by mass of titanium oxide, 10 to 80 parts by mass of a bromine-based flame retardant, and less than 45 parts by mass of magnesium hydroxide with respect to a total of 100 parts by mass of the polypropylene and the flexible resin,
• a tensile elastic modulus of the sheath is 500 MPa or less,
• a mass increase rate of the sheath is less than 50 mass % in a plasticizer migration test involving exposure in an atmosphere at 105° C. for 3,000 hours, and
• characteristic impedance is 100±10Ω.