<；P>；PROBLEM TO BE SOLVED: To provide a hydroponics device capable of sensitively controlling a nutrient solution to be supplied according to a growth state of plants, distributing risks when diseases occur, and adjusting the composition of a nutrient solution only by control of a fluid volume. <；P>；SOLUTION: This hydroponics device has a cultivation shelf unit which has a cultivation shelf allowing to hydroponically cultivate plants, a circulation flow pass which is arranged on each of the cultivation shelf units, and supplies while circulating a nutrient solution to the cultivation shelf unit, a circulation nutrient solution tank which is set on the circulation flow pass and stores solution, a nutrient solution preparing device which prepares a nutrient solution, and an independent flow pass which supplies a nutrient solution from the nutrient solution preparing device to the circulation nutrient solution tank. Furthermore, the hydroponics device has a nutrient solution adjusting function of adjusting the combination of a nutrient solution circulating in the circulation flow pass through controlling the inflow and outflow of a nutrient solution to the circulation nutrient solution tank. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
