PROBLEM TO BE SOLVED: To provide a lighting device for plant cultivation with a simple structure which condenses and guides a large amount of natural light from a light condensing part with a large area while reducing consumption of energy to guide and illuminate strong cultivation light.SOLUTION: A lighting device for plant cultivation 100, which illuminates cultivation light guided externally on the upper side of a large number of plants P arranged on cultivation shelves 171, includes a light guide part 130 equipped with a light illuminating part 140 formed in accordance with arrangement of the plants P, and a light condensing part 120 placed on one side of the light illuminating part 130 to condense external light for guiding to the light guide part 130. The light guide part 130 and a light condensing part 100 are integrally arranged without a joint in the lighting device for plant cultivation 100.COPYRIGHT: (C)2013,JPO&INPIT【課題】簡易な構成で大面積の集光部から自然光を大量に集光及び導光して、エネルギーロスを軽減し、強力な栽培光を導入、照射する植物栽培用照明装置を提供すること。【解決手段】栽培棚171に多数配列された植物Pの上方に位置して外部から導入した栽培光を照射して植物Pを育成する植物栽培用照明装置100であって、植物Pの配置に応じて形成した光照射部140を備える導光部130と、導光部130の一側に位置して外部の光を集光して導光部130に導く集光部120とを備え、導光部130と集光部110とが継ぎ目なく一体に形成されている植物栽培用照明装置100。【選択図】図2
