PURPOSE: To improve the reproduced output and the S/N, by superimposing the change in a magnetic field on a high frequency magnetic field, applying the result on one side of a magnetic recording medium, and reproducing the recording from the other side as the change in the high frequncy.

CONSTITUTION: A magnetic head 20 consists of a main magnetic pole 22 and a coil 23, and the coil 23 and a capacitor 33 constitute a tuning circuit 34. A submagnetic pole 24 has coils 25, 26, and the coil is inoperative at the recording and excited at frequencies, e.g. 80W100MHz at the reproduction. The coil 25 is inputted with a recording signal from a terminal 28 at the recording and is applied with a bias 29 at the reproduction. The change in the magnetic field by a signal from the magnetic recording medium 10 and a high frequency signal are superimposed and applied to the tuning circuit 34 at the reproduction, and the inductance of the coil 23 is changed due to the change in the magnetic field and the tuning frequency is changed. The peak value is detected 38 at a diode 35, a resistor 37 and a capacitor 36 and outputted 39. Thus, the sensitivity at the reproduction is increased and the S/N is improved.