Disclosed are a method for proliferating progenitor Schwann cells and a method for producing progenitor Schwann cells. Peripheral nerves are damaged, and cells that are derived from the peripheral nerves and have been isolated 24 hours to 6 weeks after the damaging are subjected to floating culture. In this manner, undifferentiated progenitor Schwann cells having high proliferation capability can be produced. A transplantation composition containing the undifferentiated progenitor Schwann cells is effective for the treatment of diseases associated with nerve damage or neuropathy.
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