PURPOSE: A hydroponic apparatus is provided to have an effect capable of improving the energy efficiency by using the vertical fall using gravity by the driving force by a circulation pump. CONSTITUTION: A hydroponic apparatus has a circulation structure. The circulation structure collects culture medium which has ascended to a circulation pipe by a circulation pump (11) of a reservoir (10) into a culture medium circulation part, using a tray formed in a preset inclination. The culture medium circulation part comprises an upper end culture medium circulation part (30), a first central culture medium circulation part (50), a second culture medium circulation part (60) and a third central culture medium circulation part (70). The upper end culture medium circulation part and the first central culture medium circulation part has a first preset inclination. A first circulation pipe (20) is formed in a structure to be connected to a supply hole formed in a first tray of the upper end culture medium circulation part, a collection hole formed in a second tray of the first central culture medium circulation part, a supply hole formed in a third tray of the second central culture medium circulation part, and a collection hole formed on a fourth tray of the third central culture medium circulation part, respectively. A second circulation pipe (40) is formed in a structure to be connected to a collection hole formed in the first tray of the upper end culture medium circulation part, a supply hole formed in the second tray of the first central culture medium circulation part, a collection hole formed in the third tray of the second central culture medium circulation part, and a supply hole formed in the fourth tray of the third central culture medium circulation part, respectively. [Reference numerals] (80,81,82,83,84) Lighting unit본 발명은 에너지 효율 향상 구조를 갖는 수경재배장치에 관한 것이다. 본 발명은, 저수조의 순환펌프에 의해 순환파이프로 상승된 배양액을 상기 순환파이프와 직교하는 방향으로 적어도 1개 이상의 배양액순환부 내부에, 미리 설정된 경사도로 형성된 트레이를 이용하여 상기
