A hydroponic cultivation apparatus comprises: at least cultivation containers for growing the plants； a plurality of plant supporting portions to support the plants； a plurality of nutrient solution supplying portions to supply nutrient solutions； a plurality of first switching valves； a plurality of nutrient solution discharging portions to discharge the nutrient solutions； a plurality of second switching valves； a plurality of pH value detecting portions to detect pH values of the nutrient solutions； a receptacle portion to store the nutrient solutions discharged from the plurality of nutrient discharging portions； nutrient solution circulating portions to send the nutrient solutions from the receptacle portion； and a controlling portion to control opening and closing operations of the first switching valves and the second switching valves based on the pH values detected by the pH value detecting portions.
