PROBLEM TO BE SOLVED: To attain the improving of a reproduced output by both satisfying the increase of the electric resistance and the decrease of a magnetoresistance of an MR film in a york type magnetoresistive effect(MR) head. SOLUTION: On first and second magnetic cores 4, 5 disposed to face oppositely by interposing magnetic gaps 6, 7 in the advancing direction of a recording medium. an MR film 8 is formed so that the longitudinal direction of the film becomes almost parallel with the magnetic gap 7 at a position retreating by a prescribed distance from the surface S opposite to the medium. The MR film is magnetically coupled with the first and second magnetic cores 4, 5 at its both sides. First and second leads 9, 10 are formed so as to make a sense current flow in a direction almost parallel with the magnetic gap 7 with respect to the MR head 8. Or, plural MR films are serially formed by straddling the magnetic gap 7 and also they are connected in series and the sense current is made to flow into them in the direction of this serial connection.