An immersion cooling apparatus includes: a refrigerant tank configured to store a non-boiling fluorine-based insulating refrigerant in which an electronic device is to be immersed; a circulation passage of the fluorine-based insulating refrigerant that is located between the refrigerant tank and a refrigerant cooling device; and a sealed pump that is arranged in the circulation passage, is configured to seal a rotor shaft with an impeller and a bearing portion for the rotor shaft in a sealed case while the rotor shaft and the bearing portion are immersed in the fluorine-based insulating refrigerant, and is configured to circulate the fluorine-based insulating refrigerant between the refrigerant tank and the refrigerant cooling device.