Display device illumination lamp, display device illumination device, and display device

There is provided a display device illumination lamp capable of suppressing the luminance difference between a high-voltage drive side and a low-voltage drive side. The display device illumination lamp (7) is arranged on the rear side of a display panel (3) via an optical sheet (6) and the like and driven by high voltage. The display device illumination lamp (7) includes a plurality of discharge lamps (7a to 7d) connected in series, wherein a gas pressure in the discharge lamp driven by high voltage is set higher than the gas pressure in the discharge lamp driven by low voltage.