The present invention is a plant growth apparatus 100 capable of providing a suitable growth environment for plants, and condenses the light from the LED substrate 2 on which the LED 21 that irradiates light for plant growth is mounted, and the LED 21. A lens substrate 3 having a lens portion 31 that leads to a plant, and a suction mechanism that sucks air from the space on the back side of the LED mounting surface of the LED substrate 2 are provided. The LED substrate 2 has a plurality of first through holes 2a, the lens substrate 3 has a plurality of second through holes 3a, and the flow path resistance of the first through holes 2a depends on the flow of the second through holes 3a. The first through hole 2a is larger than the road resistance and more than the second through hole 3a.本発明は、植物に好適な生育環境を与えることが可能な植物生育装置１００であり、植物生育用の光を照射するＬＥＤ２１が搭載されたＬＥＤ基板２と、ＬＥＤ２１からの光を集光して植物に導くレンズ部３１を有するレンズ基板３と、ＬＥＤ基板２のＬＥＤ搭載面の裏面側の空間から空気を吸引する吸引機構と、を備える。そして、ＬＥＤ基板２が複数の第１貫通孔２ａを有し、レンズ基板３が複数の第２貫通孔３ａを有し、第１貫通孔２ａの流路抵抗が、第２貫通孔３ａの流路抵抗よりも大きく、第１貫通孔２ａが第２貫通孔３ａよりも多く設けられている。
