The hydroponic cultivation apparatus (100) includes a cultivation tank (7) containing at least a part of the plant (8) and a liquid fertilizer (50) so as to supply the liquid fertilizer (50) to at least a part of the plant (8). Cultivation so as to wash at least one of a liquid fertilizer spraying section (5a) for spraying the water into a space in the cultivation tank (7) and at least a part of the plant (8) and an inner surface of the cultivation tank (7). A cleaning liquid discharge section (3a) for discharging a cleaning liquid into a space in the tank (7), and a discharge flow for guiding the liquid fertilizer (50) and the cleaning liquid from the cultivation tank (7) to the outside of the cultivation tank (7). Road (30).水耕栽培装置（１００）は、植物（８）の少なくとも一部を内包する栽培槽（７）と、植物（８）の少なくとも一部へ液肥（５０）を供給するように、液肥（５０）を栽培槽（７）内の空間へ噴霧する液肥噴霧部（５ａ）と、植物（８）の少なくとも一部および栽培槽（７）の内面のうちの少なくともいずれか一方を洗浄するように、栽培槽（７）内の空間へ洗浄用の液体を吐出する洗浄液吐出部（３ａ）と、栽培槽（７）から栽培槽（７）の外部へ液肥（５０）および洗浄用の液体を導く排出流路（３０）と、を備えている。
