To provide a hydroponic device by which vegetables can be cultivated indoors and in which cultivated vegetables can be grown in an optimum environment.

A cultivation device body of a hydroponic device is sectioned to form: a cultivation room in which a nursery bed is disposed; and an illuminant room in which an illuminant is arranged to emit light to the nursery bed from above. The hydroponic device includes: a first ventilation system which circulates air outside the body through the cultivation room; and a second ventilation system which circulates air outside the body through the illuminant room. A single ventilation fan is disposed so that air is forcibly circulated through the first ventilation system and the second ventilation system.