A turbo compressor to suction and compress gas includes a housing including a flow passageway through which gas flows, an impeller disposed inside the flow passageway, the impeller providing suction for the gas by being rotationally driven, a liquid discharge port provided in the flow passageway on the upstream side of the impeller, the liquid discharge port discharging, from the flow passageway, any liquid produced as the gas liquefies when the turbo compressor is stopped, a liquid discharge pipe connected to the liquid discharge port, an electromagnetic valve connected to the liquid discharge pipe, and a controller configured to open the electromagnetic valve before the impeller is rotationally driven. A refrigerator includes the turbo compressor, wherein the turbo compressor compresses refrigerant gas.