A vehicular high-voltage wire to be electrically connected to an in-vehicle high-voltage battery, the vehicular high-voltage wire including a core wire that is formed of a conductor and is to be electrically connected to the high-voltage battery, an insulating covering that covers an outer circumference of the core wire, and a cylindrical cover that covers an outer circumference of the insulating covering, wherein: the core wire, the insulating covering and the cylindrical cover are coaxially provided, and the cylindrical cover is formed by weaving a plurality of strands including a first strand formed of a conductor and a second strand formed of a reinforced fiber having insulation properties with a higher strength than the first strand.