PROBLEM TO BE SOLVED: To provide a hydroponic apparatus that enables indoor cultivation of vegetable in which vegetable to be cultivated can be raised in an optimum environment.SOLUTION: A hydroponic apparatus 1 comprises: a space cultivation apparatus body 2 in which a cultivation chamber 14 where nursery beds 4 are arranged and a light source device 5 which irradiates the nursery beds 4 with light from above are arranged in a space whose periphery is surrounded by a wall part including a pair of sidewall parts (right sidewall 8, left sidewall 9) facing each other. The right sidewall 8 includes a vent hole 80 for air inlet which introduces outside air into the cultivation apparatus body 2, the left sidewall 9 includes a vent hole 82 for air outlet which exhausts air in the cultivation apparatus body 2 to the outside, and the vent hole 80 for air inlet is arranged at a lower position than the vent hole 82 for air outlet.SELECTED DRAWING: Figure 12【課題】室内での野菜の栽培を可能とする水耕栽培装置において、栽培する野菜を最適な環境で育成し得る水耕栽培装置を提供する。【解決手段】苗床4を配置する栽培室14、及び苗床4に対して上方より光を照射する光源装置5を、相対向する一対の側壁部(右側壁8、左側壁9)を含む壁部にて周囲を囲繞された空間内に配置した栽培装置本体2を備える水耕栽培装置1であって、右側壁8は、外部の空気を栽培装置本体2内へ導入する給気用通気孔80を備え、左側壁9は、栽培装置本体2内の空気を外部へ排気する排気用通気孔82を備え、給気用通気孔80は、排気用通気孔82より低い位置に配置されている。【選択図】図12