In-vehicle communication system and communication cable

An in-vehicle communication system comprising:

• a transmitter configured to transmit a differential signal;
• a receiver configured to receive the differential signal;
• and a communication cable connecting between the transmitter and the receiver and configured to transmit the differential signal, wherein the communication cable includes:
• a twisted wire in which a first coated wire and a second coated wire are twisted together;
• a sheath covering the twisted wire;
• and a talc layer provided between the twisted wire and the sheath, the sheath includes:
• a tubular part surrounding the first coated wire and the second coated wire;
• and a pair of ribs each extending spirally in an extension direction of the communication cable while protruding inward of the communication cable from the tubular part to between the first coated wire and the second coated wire, in a transverse section of the communication cable, the pair of ribs are located across a straight line connecting a conductor center of the first coated wire and a conductor center of the second coated wire, so as to demarcate a first space in which the first coated wire is disposed and a second space in which the second coated wire is disposed, the talc layer is provided along a surface of the twisted wire, a section of the communication cable in the extension direction is a straight section extending in a straight line, and another section thereof is a bent section extending in a bent manner, the pair of ribs demarcate the first space and the second space in both the straight section and the bent section, an inter-conductor distance between the first coated wire and the second coated wire is constant in both the straight section and the bent section, and an insulating coating of the first coated wire and an insulating coating of the second coated wire are not fused together.