In communication cable of high capacity, conductor of diameter d is coated by insulation material to form wire of diameter D, plural number of the wire are twisted by pitch p to form pairs, plural number of the pairs are twisted by collective pitch P. The communication cable of high capacity has sheath wrapping the pairs, and impedance (Z) of the wire is from 90 to 110, and, diameter (d) of the conductor is from 0.48 mm to 0.65 mm, and diameter (D) of wire is from 0.8 mm to 1.15 mm, and the pitch (p) is from 7 mm to 30 mm, and the collective pitch (P) is from 40 mm to 150 mm, and relative ratio of diameter of wires to diameter of conductor D/d is from 1.625 to 1.835.