LED lighting device and plant cultivation shelf

An LED lighting device adapted for illuminating an illumination plane, comprising:

• a substrate formed in an elongated shape;
• three reflectors, of which one first reflector is formed in a single rail shape on a surface of the substrate, wherein a first reflecting surface is formed on each of both side surfaces of the first reflector, and one pair of rail-shaped second reflectors is formed on the surface of the substrate;
• and
• a plurality of LED elements arranged in rows at positions on both sides of the first reflector on the surface of the substrate and adapted to emit light in an optical axis direction orthogonal to the illumination plane,
• wherein
• the pair of rail-shaped second reflectors is formed on the surface of the substrate in such a manner that each of the pair of rail-shaped second reflectors comprises one single second reflecting surface formed on an inner side surface of the corresponding second reflector and that the plurality of LED elements and the first reflector are interposed between the pair of rail-shaped second reflectors for obtaining a flattened illumination distribution in the illumination plane, and
• wherein:
• on a cross-section along the optical axis direction, the first reflector has a symmetric shape with respect to a center axis of the first reflector, the center axis of the first reflector being parallel to the optical axis;
• on the cross-section, the pair of the second reflectors are symmetric to one another with respect to the center axis of the first reflector;
• and
• on the cross-section, each of the second reflectors is asymmetric with respect to any line parallel to the center axis of the first reflector.