To provide a balustrade illumination fixture in which mechanical strength can be improved.

A fixture main body 11 has an opening part 12 at one side of the longitudinal direction, and end plates 13 are fitted to both end opening parts of the opening part 12. The end plate 13 is fixed to the fixture main body 11 via a reinforced plate 27 in which the cross-section arranged inside the fixture main body 11 is formed in U-shape. A light source lamp 18 is arranged and installed opposed to the opening part 12 at the fixture main body 11, and an opening part cover 16 is opening and closing freely mounted on the fixture main body 11 with a hinge so as to cover the opening part 12.