Electrolytic machining method, method for manufacturing dynamic pressure bearing devices, and dynamic pressure bearing devices manufactured according to the manufacturing method
   
   

An electrolytic machining method for electrolytically machining a workpiece is provided. The method uses a masking member having through-hole patterns that correspond to the shapes of concave parts to be formed in the workpiece. The masking member is brought in contact with a machining surface of the workpiece. An electrolytic solution is supplied and allowed to flow in the gap between the masking member and an electrode tool. The electrolytic solution is allowed to enter into and flow within the through-hole patterns of the masking member in order to electrolytically machine surfaces of the workpiece only in the through-hole patterns.

 
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