A wiring portion has first and second write conductors, first and second read conductors, and an insulating layer. The first write conductor, first and second read conductors, and second write conductor are arranged three-dimensionally at different height levels in the thickness direction of the insulating layer, in a cross section extending in the width direction of the wiring portion. The distance from the first write conductor to the first read conductor is equal to the distance from the first write conductor to the second read conductor. The distance from the second write conductor to the first read conductor is equal to the distance from the second write conductor to the second read conductor.