PURPOSE:To improve the electric characteristic by providing a groove to a coating film formed by applying a magnetic paint and providing a reinforcement member to the groove so as to improve the coating film intensity of the magnetic disc. CONSTITUTION:The magnetic paint formed by mixing magnetic powder 2 and a reinforcement member 4 in a binder 3 on an aluminum base 1 of the magnetic disc is spin-coated to scatter the magnetic powder 2 into uniform bundle and the reinforcement member 4 is fitted to a gap between bundles. After the spin coating, the magnetic disc 7 is loaded to a spindle 6 of a magnetic field orientation device, and four sets of magnets one set as two magnets are oriented to the face of the disc 7 at an interval of 90 deg.. Then the groove 9 is provided to the coating film formed by applying spin coating to the magnetic paint, the reinforcement member 4 is kept in the groove 9 to improve the coating film strength of the magnetic disc 7 thereby improving the electric characteristic.