To provide a method for safely producing a hydrogenated norbornene polymer realizing a process to operate at a high polymer solution temperature without causing the corrosion of the metallic parts of a production facility and achieving high productivity.

The method for producing a hydrogenated norbornene polymer comprises the polymerization of a norbornene monomer in the presence of a polymerization catalyst to obtain a norbornene polymer, the addition of a heterogeneous catalyst to the norbornene polymer, the hydrogenation of the norbornene polymer and the removal of the heterogeneous catalyst from the hydrogenation reaction liquid wherein the water content in the hydrogenation reaction liquid in the removal of the heterogeneous catalyst is ≤100 ppm.

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