The hydroponic cultivation apparatus (100) comprises: a cultivation tank (80) that has a light shielding property and is configured to accommodate underground part (12) of a plant (10)； a partitioning portion (50) that has a light shielding property and that is configured to cover the opening at the upper end of the cultivation tank (80) and partitions an underground space (12A) where the underground part (12) of the plant (10) grows and an aboveground space (11A) where aboveground part (11) of the plant (10) grows, wherein the partitioning portion (50) includes； a fixed member (123), a position of which is fixed with respect to the cultivation tank (80), and including a through hole surrounding a stem of the plant (10) and maintains a closed state where it is suppressed that light is irradiated to the underground part (12) of the plant (10)； and a door member (4) that is attached to the fixed member (123) in a state where it is movable with respect to the fixed member (123) and changes to a closed state where it is suppressed that light is irradiated to the underground part (12) of the plant (10) and to an open state where it is possible to view the underground part (12).
