A hydroponic cultivation apparatus includes: a cultivation chamber underground portion internally including an underground space where a subterranean part of a plant grows such that the underground space is separated from above-ground space where aerial part of the plant grows； an underground temperature adjuster which adjusts a temperature of an atmosphere inside the underground space； and a controller which controls the underground temperature adjuster, in which the controller includes a dormancy determination unit which determines whether a time of cultivation of the plant is a dormant period when leaves of the aerial part wither, and a temperature controller which makes the underground temperature adjuster adjust the temperature of the atmosphere inside the underground space so as to facilitate germination of the plant in a case where the dormancy determination unit determines that the time of cultivation of the plant is the dormant period when leaves of the aerial part wither.
