PROBLEM TO BE SOLVED: To provide a hydroponic device, while keeping an initial capital investment cost and running costs to be lower, capable of feeding suitable nutrient liquid to plants at different growing stages or different kinds of plants in each of cultivation beds, and not expanding disease as much as possible even if the disease infests the plants.SOLUTION: This hydroponic device having cultivation beds 1, flowing solution 3 from rear to front and having a float plate 2 on the solution 3 is provided by forming a water-discharging part 4 for discharging the solution 3 and falling it down at the front part, further installing a falling water-receiving part 5 for receiving the falling down solution 3, installing a circulation pump 6 for pumping up the water at the bottom part of the water-receiving part 5 and sending it to rear direction, a pipe 7 connected with the circulation pump 6, and an ejection port 8 at the tip end of the pipe for discharging the solution 3 at the inside of rear part of the cult
