Magnetic recording method and magnetic recording device

In magnetic transfer performed to transfer an information signal such as a servo signal from a master medium to a slave medium, the degradation of transfer quality caused by a failure of close contact between the master medium and the slave medium due to dust accumulated thereon is prevented. Magnetic transfer means (11) is provided to carry out the magnetic transfer by bringing the master medium bearing information and the slave medium into close contact with each other, and applying a transfer magnetic field. Replacing means (12,51,5) is provided to prepare a plurality of master media (3), and replacing the master medium after magnetic transfer is performed a predetermined number of times. Cleaning means (13) is also provided to clean the replaced master medium by ultrasonic washing or the like.