A superconducting coil pre-cooling method for cooling a superconducting coil in a superconducting magnet apparatus until the superconducting coil enters a superconducting state, the superconducting magnet apparatus including: the superconducting coil; a helium tank that houses the superconducting coil and liquid helium; a radiation shield that houses the helium tank; a vacuum case that houses the radiation shield; and a refrigerator having a first cooling stage thermally connected to the radiation shield, and a second cooling stage configured to condense a working medium in the helium tank, the helium tank including: a tank body that houses the superconducting coil; a refrigerator surrounding tube extending upward from the tank body and surrounding the refrigerator; and a communicating tube which extends upward from the tank body and through which an inside of the tank body and an outside communicate with each other, the vacuum case including: a first tubular portion that surrounds the refrigerator surrounding tube; and a second tubular portion that surrounds the communicating tube, a passage being disposed between the refrigerator and the radiation shield, the superconducting coil pre-cooling method comprising: a supplying step of supplying a working medium in a gaseous state having a condensation point lower than a condensation point of nitrogen into the refrigerator-surrounding tube; a cooling step of cooling the superconducting coil in the tank body by the working medium in the gaseous state that is cooled in the first cooling stage and further cooled in the second cooling stage after passing through the passage; and a discharging step of discharging the working medium that has cooled the superconducting coil in the tank body, out of the vacuum case through the communicating tube. the superconducting coil; a helium tank that houses the superconducting coil and liquid helium; a radiation shield that houses the helium tank; a vacuum case that houses the radiation shield; and a refrigerator having a first cooling stage thermally connected to the radiation shield, and a second cooling stage configured to condense a working medium in the helium tank, the helium tank including: a tank body that houses the superconducting coil; a refrigerator surrounding tube extending upward from the tank body and surrounding the refrigerator; and a communicating tube which extends upward from the tank body and through which an inside of the tank body and an outside communicate with each other, a tank body that houses the superconducting coil; a refrigerator surrounding tube extending upward from the tank body and surrounding the refrigerator; and a communicating tube which extends upward from the tank body and through which an inside of the tank body and an outside communicate with each other, the vacuum case including: a first tubular portion that surrounds the refrigerator surrounding tube; and a second tubular portion that surrounds the communicating tube, a first tubular portion that surrounds the refrigerator surrounding tube; and a second tubular portion that surrounds the communicating tube, a passage being disposed between the refrigerator and the radiation shield, a supplying step of supplying a working medium in a gaseous state having a condensation point lower than a condensation point of nitrogen into the refrigerator-surrounding tube; a cooling step of cooling the superconducting coil in the tank body by the working medium in the gaseous state that is cooled in the first cooling stage and further cooled in the second cooling stage after passing through the passage; and a discharging step of discharging the working medium that has cooled the superconducting coil in the tank body, out of the vacuum case through the communicating tube.