[Technical Problem] To provide a deep hole machining apparatus capable of increasing the durability of a guide bush. [Solution] The deep hole machining apparatus 1 performs a hole cutting or the like in the workpiece 2. The guide bush 30, which is deposed radially outward of the cutting tool 20 separately from the outer periphery of the cutting tool 20, includes the injection hole 31 for injecting oil toward the outer periphery of the cutting tool 20. Accordingly, since an oil film is formed between the inner wall of the guide bush 30 and the cutting tool 20, the cutting tool 20 rotates out of contact with the inner wall of the guide bush 30.
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