A magnetic head includes a magnetic sensor layer and upper and lower read shields sandwiching the magnetic sensor layer. At least one of the upper and lower read shields includes at least one end portion having a plurality of portions isolated in a core width direction of the magnetic sensor layer. The portions are isolated at least on an air bearing surface side. In this manner, edge noise can be suppressed even if external magnetic field noise or radio noise acts on the upper read shield, the lower read shield, the trailing shield, or the return yoke.