To provide a water tank and a cooling tower equipped with the same as well as the manufacturing method of a semi-conductor device, eliminated in the fear of trouble and capable of preventing the suction of air with a simple structure without increasing a weight or a cost.
The water tank 21 is provided with a bottom surface 6 having a water suction port 5 for discharging water and an air suction preventing member 8 for covering the water suction port 5 at the upper part of the same which is apart from the bottom surface 6 through a gap 7 for the inflow of water into the water suction port 5. The air suction preventing member 8 is arranged so as to preclude the suction of air through the water suction port 5, which is caused by the generation of vortexes in the water suction port 5.
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