A plant cultivation room provided with a plant cultivation area and an illumination lamp for irradiating light onto the upper surface side thereof, wherein at least a portion of the inner surface of the plant cultivation room comprises of a plant cultivation room inner surface constituent member composed of a material containing a far-infrared emission substance that emits and absorbs far-infrared and in which the emissivity of far-infrared is 0.6 or higher, and the surface of the illumination lamp has a coating layer containing the same far-infrared emission substance as the far-infrared emission substance of the plant cultivation room inner surface constituent member and is provided with a cooling and/or heating source having a cooling and/or heating surface composed of a material containing the same far-infrared emission substance as the far-infrared emission substance of the plant cultivation room inner surface constituent member. When the cooling surface of the cooling source is cooled, the far-infrared emission substance of the cooling surface absorbs far-infrared emitted by the plant cultivation room inner surface constituent member and the far-infrared emission substance of the illumination lamp. Also, when the heating surface of the heating source is heated, the far-infrared emission substance of the plant cultivation room inner surface constituent member and the illumination lamp absorb the far-infrared emitted by the far-infrared emission substance of the heating surface. In accordance with the present invention, it is possible to provide a plant cultivation system in a plant cultivation device having a temperature-regulating system with excellent comfort for both plants and workers, and with very high energy efficiency in a cultivation room space such as a plant factory.本發明係於具有植物栽培區域及在其上面側照射光之照明燈而成之植物栽培室中，植物栽培室之內面至少一部分由植物栽培室內面構成構件形成，該植物栽培室內面構成構件係以含有放射、吸收遠紅外線且遠紅外線放射率為0.6以上之遠紅外線放射物質的材料所構成者；照明燈之表面係具有被覆層而成，該被覆層含有與前述遠紅外線放射物質同一遠紅外線放射物質；又，設置有具有冷卻及/或加熱面之冷卻及/或加熱源
