The hydroponic cultivation apparatus (1) of the present invention includes a container (10), a cover (50), a nutrient solution supply unit (20) for supplying a nutrient solution (W) to a hollow portion (12s) of the container (10), and a water level adjuster (60). 5 The container (10) is formed in a tubular shape. The cover (50) has a size such that the cover (50) can protect rhizosphere (R) and cover the opening (14) of the container (10). The water level adjuster (60) is connected to the container (10) and enables adjustment of the water level of the nutrient solution (W) in the hollow portion (12s). 10
