An object of the description is to provide a conductive wire with a small diameter. A conductive wire configured to be arranged in a vehicle and electrically connect electrical devices includes: a rigid wire having a first core wire, and a first insulating coating that covers an outer circumference of the first core wire; and a flexible wire having a second core wire that is superior to the first core wire in terms of flexibility and is connected to an end of the first core wire, and a second insulating coating that covers an outer circumference of the second core wire. A wall thickness T1 in a radial direction of the first insulating coating of the rigid wire is smaller than a wall thickness T2 in a radial direction of the second insulating coating of the flexible wire.