A surface processing method of rare-earth permanent magnet

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PROBLEM TO BE SOLVED : To provide a blast working device excellent in working efficiency of a workpiece and capable of restraining cracking and chipping of the workpiece. SOLUTION : A first blast working device constitutes its characteristic feature of arranging a projection nozzle to project a projecting material on a workpiece from the outside of a cylindrical barrel formed of mesh to store the workpiece free to rotate around a central xis as its center. Additionally, a second blast working device constitutes its characteristic feature of supporting a cylindrical barrel formed of mesh to store the workpiece outside in the peripheral direction of a central axis of a supporting member free to rotate around the central axis as its center free to revolve and arranging a projection nozzle so that the cylindrical barrel moves to revolve around the central axis of the supporting member as its center and the projecting material is projected against the workpiece from the outside of the cylindrical barrel moving to revolve.