To provide a plant cultivation apparatus preventing occurrence of bubbles and supplying a gas dissolved solution in which oxygen is dissolved at a high concentration to plants.

This plant cultivation device has a gas dissolving device (A) and a cultivation container 36 for cultivating a plant 35. The gas dissolving device (A) has a pressurizing part 1 which forcefully feeds liquid, a gas pouring part 2 which pours oxygen as gas into liquid, a pressurizing dissolving part 3 which dissolves gas in liquid by pressure caused by forcefully feeding liquid into which gas is poured, by the pressurizing part 1, and a depressurizing part 4 which sequentially depressurizes to an atmospheric pressure, a pressure of a gas dissolved solution in which gas is dissolved in the pressurizing dissolving part 3, through gradually quickening a current speed of the gas dissolved solution from an inflow side to an outflow side of the gas solution. Furthermore, the gas dissolving device A includes continuously driving each of the parts of the pressurizing part 1, the gas pouring part 2, and the gas dissolving part 3, continuously supplying the gas dissolved solution to the depressurizing part 4, and continuously ejecting the gas dissolved solution causing no bubble from an outflow side of the depressurizing part 4. The plant cultivation apparatus includes supplying the gas dissolved solution causing no bubble ejected from an outflow side of the depressurizing part, to the cultivation container 36.