A plant cultivation apparatus is provided with a cultivation rack having a plurality of supporting frames arranged in multiple levels in the vertical direction, a cultivation bed body supported by each of the plurality of supporting frames, that forms a storage tank for storing a nutrient solution, a heat insulating layer applied to the outer side of the cultivation bed body, and a lighting part, supported by each of the plurality of supporting frames, for applying illumination in the direction of the cultivation bed on the lower level. Heat generated from the lighting is blocked by a heat insulating layer coating the cultivation bed body. The heat insulating layer is small size in comparison to a heat insulating material such as polystyrene foam or the like. For this reason, the impact of heat to the cultivation bed can be reduced and uniform cultivation conditions can be obtained, without increasing the size of the cultivation rack.本發明之植物栽培裝置包括：栽培用支架，其包括於鉛垂方向排列成多段之複數個支持框架；栽培床本體，其被支持於複數個支持框架之各者，並形成用以儲存培養液之貯存槽；隔熱層，其塗佈於栽培床本體之外側；及照明部，其被支持於複數個支持框架之各者，且對下側之段之栽培床之方向進行照明。照明之發熱藉由塗佈於栽培床本體之隔熱層予以遮擋。該隔熱層與發泡苯乙烯等隔熱材料相比尺寸較小。因此，不增大栽培用支架之尺寸便可降低熱對栽培床之影響，從而可使栽培條件均勻化。
