1. A multi-conductor cable for a vehicle, comprising:core wires respectively having a conductor formed by a plurality of twisted wires, and an insulating layer covering an outer periphery of the conductor; and
a sheath layer disposed around the core wires,
wherein a marking portion is partially formed on an outer peripheral surface of the sheath layer, and
wherein a ratio of an arithmetic average roughness Ra2 of a peripheral region adjacent to the marking portion, with respect to an arithmetic average roughness Ra1 of the marking portion, at the outer peripheral surface, is 0.10 or greater and 0.90 or less.