Hot cathode discharge lamp, lamp unit, and display device

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A hot cathode discharge lamp (20) includes a glass bulb (22) having a protective film (24) and a phosphor layer (26) laminated on an inner face thereof and having mercury (21) and a buffer rare gas mixture enclosed therein, and bead-mounted electrodes (30a, 30b). The hot cathode discharge lamp (20) is used as a light source in a backlight unit, in a 50°C to 70°C atmosphere. The buffer rare gas mixture includes krypton at a partial pressure rate of 20% or more.