An illumination device for plant cultivation, having: a plurality of LEDs which are arranged more densely in at least one of the two end sections of an LED layout range extending in a first direction than in the center part and a diffusion part for causing light emitted towards a plant from the plurality of LEDs to diffuse.植物栽培用之照明裝置具有:複數個LED,是配置成朝第1方向延伸之LED配置範圍之兩端部之至少任一者比中央部緊密;及擴散部,使從複數個前述LED朝向植物方向發出之光擴散。5‧‧‧照明器具50‧‧‧LED56‧‧‧基板CL‧‧‧中心線d1‧‧‧間距R2‧‧‧LED配置範圍Δx1‧‧‧預定範圍X,Y‧‧‧方向X3,X4‧‧‧IED配置範圍R2之最外位置
