A method of installing a superconducting cable, wherein the method comprises: inserting, at room temperature, the superconducting cable into an inner pipe of a thermally insulated double pipe including the inner pipe adapted to house the superconducting cable therein and an outer pipe housing the inner pipe therein, a vacuum layer that is a gap between an outside of the inner pipe and an inside of the outer pipe in the thermally insulated double pipe being evacuated; thereinafter fixing one end of the superconducting cable protruding from an end portion of the inner pipe opposite to a side from which the superconducting cable has been inserted, while the other end of the superconducting cable being set to a free end; thereinafter introducing a refrigerant into the inner pipe from a side from which the superconducting cable has been inserted to cool the superconducting cable to temperature that brings the superconducting cable into a superconducting state; and relaxing fixation of the one end of the superconducting cable after the superconducting cable has been cooled to the temperature that brings the superconducting cable into a superconducting state; thereinafter pushing the superconducting cable into the inner pipe of the thermally insulated double pipe from the one end with the fixation thereof being relaxed; thereinafter fixing the one end and the other end of the superconducting cable to the thermally insulated double pipe; and thereinafter temperature raising is performed, without flowing a gas for temperature raising into the thermally insulated double pipe, heat entering from an entirety of the thermally insulated double pipe and the temperature of the superconducting cable being raised uniformly in a longitudinal direction of the superconducting cable, thus that the superconducting cable assumes a linear shape when cooled to the temperature that brings the superconducting cable into superconducting state, while it deforms into a helical shape when the temperature raising is performed. inserting, at room temperature, the superconducting cable into an inner pipe of a thermally insulated double pipe including the inner pipe adapted to house the superconducting cable therein and an outer pipe housing the inner pipe therein, a vacuum layer that is a gap between an outside of the inner pipe and an inside of the outer pipe in the thermally insulated double pipe being evacuated; thereinafter fixing one end of the superconducting cable protruding from an end portion of the inner pipe opposite to a side from which the superconducting cable has been inserted, while the other end of the superconducting cable being set to a free end; thereinafter introducing a refrigerant into the inner pipe from a side from which the superconducting cable has been inserted to cool the superconducting cable to temperature that brings the superconducting cable into a superconducting state; and relaxing fixation of the one end of the superconducting cable after the superconducting cable has been cooled to the temperature that brings the superconducting cable into a superconducting state; thereinafter pushing the superconducting cable into the inner pipe of the thermally insulated double pipe from the one end with the fixation thereof being relaxed; thereinafter fixing the one end and the other end of the superconducting cable to the thermally insulated double pipe; and thereinafter temperature raising is performed, without flowing a gas for temperature raising into the thermally insulated double pipe, heat entering from an entirety of the thermally insulated double pipe and the temperature of the superconducting cable being raised uniformly in a longitudinal direction of the superconducting cable, thus that the superconducting cable assumes a linear shape when cooled to the temperature that brings the superconducting cable into superconducting state, while it deforms into a helical shape when the temperature raising is performed.