A cover insulating layer is formed on a base insulating layer. One of write wiring traces includes first to third lines, and the other write wiring trace includes fourth to sixth lines. The one and other write wiring traces constitute a signal line pair, the second and fifth lines are arranged on an upper surface of the cover insulating layer, and the third and sixth lines are arranged on an upper surface of the base insulating layer. At least parts of the second and fifth lines are respectively opposed to the sixth and third lines with the cover insulating layer sandwiched therebetween. The second and third lines are electrically connected to the first line, and the fifth and sixth lines are electrically connected to the fourth line. The fourth line is electrically connected to at least one of the fifth and sixth lines through a jumper wiring on a lower surface of the base insulating layer.