Vapor deposition film formed on the surface of the rare-earth permanent magnet

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PROBLEM TO BE SOLVED : To provide a manufacturing method of a rare earth-based permanent magnet for forming a uniform deposition film as a corrosion-resistant film having excellent coherency on the surface stably, without generating cracks and cutout during manufacture and deteriorating magnetic characteristics. SOLUTION : The manufacturing method should include a process for forming a deposition film on the surface of an aging treatment body, by performing deposition treatment to an aging treatment body after a rare earth-based permanent magnet sintering body having a desired composition is subjected to cutting machining and/or grinding machining, and an obtained machining body is washed for carrying out aging treatment.