PROBLEM TO BE SOLVED: To provide a lighting device which is capable of growing a plant efficiently with low power consumption.SOLUTION: The lighting device for growing a plant includes: not less than two sorts of semiconductor light-emitting element, each having a peak emission wavelength in a range of 380 nm to 500 nm, which range is a range of an absorption wavelength of a photosynthetic pigment, and being different from each other in peak emission wavelength by not less than 5 nm； and a red fluorescent material which is excited by light of at least one of the not less than two sorts of semiconductor light-emitting element and has a peak emission wavelength in a range of 600 nm to 780 nm.【課題】効率的かつ低消費電力で植物の育成を可能とする照明装置を提供する。【解決手段】光合成色素の吸収波長である３８０～５００ｎｍにピーク発光波長を有し、且つピーク発光波長が互いに５ｎｍ以上異なる２種類以上の半導体発光素子と、少なくとも１種類の上記半導体発光素子の光により励起して６００～７８０ｎｍにピーク発光波長を有した赤色の光を発する赤色蛍光体と、を具備する。【選択図】図１
