PROBLEM TO BE SOLVED: To provide a plant cultivation lighting device simultaneously attaining the followings: improvement in energy efficiency reduction in load on the environment improvement in cultivation efficiency for growing plant stocks securement of flexibility of layout in lighting means for radiating cultivation light to plants reduction in time and labor for forming fiber optics every time when the layout is changed and avoidance of quality deterioration of the plants.SOLUTION: The plant cultivation lighting device is structured as follows: light-guiding branch line members 120 have a plurality of light-reflecting surfaces 121 set in a longitudinal direction of the light-guiding branch line members 120 while spaced from each other so as to correspond to respective intervals between a plurality of plant stocks P, and obliquely intersecting respectively in a longitudinal direction so that the plant stocks P are each irradiated with cultivation light L2.COPYRIGHT: (C)2011,JPO&INPIT【課題】エネルギー効率の向上、環境への負荷の低減、植物株を成長させる栽培効率の向上、植物に栽培光を照射する照射手段におけるレイアウトの自由度の確保、レイアウト変更毎に光ファイバーを成形しておく手間の低減、および植物の品質低下の回避を同時に実現する植物栽培用照明装置を提供すること。【解決手段】導光性支線部材120は、複数の植物株P相互の間隔のそれぞれに対応して導光性支線部材120の長手方向に相互に離間して設けられているとともに栽培光L2が複数の植物株Pのそれぞれに照射されるように長手方向に各々斜めに交差する複数の光反射面121を有している。【選択図】図3
