PROBLEM TO BE SOLVED: To provide a hydroponic device which reduces decay and withering of a plant.SOLUTION: A hydroponic device comprises: a culture tank 1; a support part 2 for supporting a plant P so that a root Q of the plant P is positioned in the culture tank; a mist supplying part 3 for supplying a nutritious liquid F to the root Q of the plant P by spraying the nutritious liquid F; and a moisturizing part 4 which is formed in a bag shape including the root Q of the plant P and has permeability.