A rotating mechanism of an industrial machine includes: a first member of the industrial machine; a case fixed to the first member; a reduction unit which is held in the case, and decelerates and outputs rotation input; a second member of the industrial machine, fixed together with the reduction unit; a center gear disposed on the first member side to input rotation to the reduction unit; and an intermediate gear engaged with the output gear of a driving unit while being engaged with the center gear, and disposed on the first member side.
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