An object of the present invention to provide a fluorescent lamp in which after formation of a phosphor layer, a glass bulb is bent and in which the phosphor layer is not subject to cracking or peel-off even in bent parts with a small radius of curvature, thus offering a good appearance. A fluorescent lamp includes a glass bulb 1 having bent parts, a protective film 2 having a fine grain layer 2a comprising fine grains of average grain size at most 100 nm and attached to an inner surface of the glass bulb, and large-sized grains some of which are buried in the fine grain layer 2a, the other large-sized grains projecting from the fine grain layer 2a, a phosphor layer 3 formed on the protective film 2 of the glass bulb 1, discharge inducing means 4, 4 sealably installed in opposite ends of the glass bulb 1, and a discharge medium sealed in the glass bulb 1.