PROBLEM TO BE SOLVED: To make a uniform air flow throughout a raising seedling space and to enable irradiation of an artificial light source evenly, in a multistage raising seedling apparatus that cultivates a plant seedling inside a closed structure using an artificial light source.SOLUTION: An artificial light source 6 is installed at the ceiling part of a raising seedling shelf 3 and a through hole 7 is installed to install a ventilation fan 8, a raising seedling bed 4 is installed through a raising seedling bed-support rod 9 on a ceiling part side-shelf board 2 of the raising seedling shelf 3 in a middle stage to ensure an air exhaust passage in the raising seedling shelf 3 in the lower stage, a reflection member 10 is attached to the side face of the raising seedling shelf 3 to generate a uniform air flow in which the air is drawn in from an opening of the lower part and out upward, light is reflected to inside by a reflecting member 10, whereby unevenness in quantity of light is suppressed, and swinging of the reflecting member 10 while being curved by an air flow allows light to reach until the back side of a leaf.SELECTED DRAWING: Figure 1【課題】閉鎖型構造物の内部で人工光源を用いて植物の苗を育成する多段式育苗装置において、育苗空間全域に均一な空気の流れをつくるとともに人工光源の光をムラなく照射できるようにする。【解決手段】育苗棚３の天部に人工光源６を設置するとともに貫通孔７を設けて送風ファン８を設置し、中段の育苗棚３の天部側棚板２上に育苗ベッド支持棒９を介して育苗ベッド４を設置して下段の育苗棚３の空気排出通路を確保し、また、育苗棚３の側面に反射部材１０を取り付け、下部の隙間から空気が吸い込まれて上方へ吸い出されるムラのない空気の流れを生じさせ、また、光が反射部材１０で内側へ反射することで光量ムラが抑制され、反射部材１０が空気の流れで内側に湾曲しつつ揺らぐことにより葉の裏側まで光が届くようにする。【選択図】図１
