Signal transmission cable and multi-wire cable

A signal transmission cable comprising:

• a plurality of inner insulated wires stranded with each other, each of the inner insulated wires comprising:
• an inner conductor;
• an insulating layer mainly composed of a fluorine resin provided at an outer periphery of the inner conductor;
• a skin layer mainly composed of a fluorine resin and doped with a titanium oxide and a carbon black as color pigment and provided at an outer periphery of the stranded inner insulated wires;
• an outer conductor provided at an outer periphery of the skin layer;
• and
• a sheath layer comprising an insulator and provided at an outer periphery of the outer conductor,
• wherein the skin layer comprises 0.09 wt % to 0.46 wt % of the carbon black and 0.33 wt % to 1.62 wt % of the titanium oxide.