PROBLEM TO BE SOLVED: To provide a hydroponic system capable of avoiding extinction of plants in pots for a long time in the case where power supply is stopped.SOLUTION: A top surface 7a of a bottom plate 7A is structured in a horizontal flat surface, a supply port 21A of a supply pipe 21 is positioned above a liquid level 26A of a culture solution 26 in a support body 2 to make culture solution 26 in the support body 2 to flow in a predetermined direction and increase a dissolved oxygen amount, and the culture solution supplied from the supply port 21A is ejected from a direction crossing the liquid level 26A of the culture solution 26 in the support body 2, and an ejection amount of the culture solution supplied from the supply port 21A is set such that a height from the top surface 7a of the bottom plate 7A to the liquid level 26A of the culture solution 26 becomes 3 mm or more and a half or less than a height from the top surface of the bottom plate 7A to a bottom surface 7d of a top plate 7C.
