Provided are a patent document generation device, a patent document generation method, and a patent document generation program that can keep the quality of a generated patent application specification constant. The patent document generation device receives a claim of a patent document, a description other than the claim of the document, and a learning unit that learns a correspondence relationship of a description of a prior art document associated with the patent document, and receives a new claim. A receiving unit; and a generating unit configured to generate a text other than the new claim corresponding to the new claim based on a learning result by the learning unit and the new claim received by the receiving unit.
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