A cooling apparatus includes: a first air nozzle configured to spray air to the metal strip from above; a first water nozzle configured to spray water to the metal strip from above; and a gas discharging part configured to discharge an air around the metal strip upwardly, wherein the first air nozzle, the first water nozzle and the gas discharging part are aligned along a transport direction of the metal strip in the order of the first air nozzle, the first water nozzle and the gas discharging part, wherein the cooling apparatus is adapted to collide the air from the first air nozzle against the metal strip and then the air moves along a surface of the metal strip to a point at which steam is generated by the water from the first water nozzle, and is adapted to discharge the steam using the gas discharging part.