A magnetic sensor includes a magneto-sensitive portion (105); an excitation wiring (110) formed in a wiring region above the magneto-sensitive portion (105) through intermediation of an insulating film (12), the excitation wiring (110) including a plurality of conductor portions (1101, 1102, 1103, 1104, and 1105) arranged in in order across at least one radial direction from a center axis of the magneto-sensitive portion (105); a current flowing through the excitation wiring (110) having a current density of which an absolute value becomes zero in a vicinity of a center of the magneto-sensitive portion (105) and continuously increases toward an outer side of the magneto-sensitive portion (105); and a magnetic field generated by the current flowing through the excitation wiring (110) in a direction vertical to the surface of the magneto-sensitive portion (105).