A hydroponic cultivation apparatus configured to grow plants, wherein the apparatus comprises: at least two cultivation containers (30A, 30B) for growing the plants, respectively; a plurality of plant supporting portions that are provided to the cultivation containers and configured to support the plants above the cultivation containers, respectively; a plurality of nutrient supplying portions (3A,3B) that are provided to the cultivation containers and configured to supply nutrient solutions to the cultivation containers, respectively; a plurality of first switching valves (4A, 4B) provided to the nutrient supplying portions, respectively; a plurality of nutrient discharging portions (5A,5B) that are provided to the cultivation containers and configured to discharge the nutrient solutions from the cultivation containers, respectively; a plurality of second switching valves (6A, 6B) provided to the nutrient discharging portions, respectively; a plurality of pH value detecting portions (8A,8B) that are provided to the cultivation containers and configured to detect pH values of the nutrient solutions stored in the cultivation containers, respectively; a receptacle portion configured to store the nutrient solutions discharged from the plurality of nutrient discharging portions; one or more nutrient solution circulating portions (2A, 2B) configured to send the nutrient solutions from the receptacle portion to the nutrient solution supplying portions, respectively; and one or more controlling portions (1A, 1B) configured to control at least opening and closing operations of the second switching valves (6A, 6B) based on the pH values detected by the pH value detecting portions (8A,8B), respectively. at least two cultivation containers (30A, 30B) for growing the plants, respectively; a plurality of plant supporting portions that are provided to the cultivation containers and configured to support the plants above the cultivation containers, respectively; a plurality of nutrient supplying portions (3A,3B) that are provided to the cultivation containers and configured to supply nutrient solutions to the cultivation containers, respectively; a plurality of first switching valves (4A, 4B) provided to the nutrient supplying portions, respectively; a plurality of nutrient discharging portions (5A,5B) that are provided to the cultivation containers and configured to discharge the nutrient solutions from the cultivation containers, respectively; a plurality of second switching valves (6A, 6B) provided to the nutrient discharging portions, respectively; a plurality of pH value detecting portions (8A,8B) that are provided to the cultivation containers and configured to detect pH values of the nutrient solutions stored in the cultivation containers, respectively; a receptacle portion configured to store the nutrient solutions discharged from the plurality of nutrient discharging portions; one or more nutrient solution circulating portions (2A, 2B) configured to send the nutrient solutions from the receptacle portion to the nutrient solution supplying portions, respectively; and one or more controlling portions (1A, 1B) configured to control at least opening and closing operations of the second switching valves (6A, 6B) based on the pH values detected by the pH value detecting portions (8A,8B), respectively.