A discharge lamp emitting ultraviolet light with a wavelength band of less than 220 nm, the purpose of which is to suppress the generation of halides from an insulating conductor extending outside the tube body. In the discharge lamp sealed with a light emitting substance with a wavelength less than 220 nm, an insulating conductor covered with a non halogen insulator is used as the insulating conductor for the external extension of the tube body. When the insulator is a high molecular compound with aromatic ring and / or heterocycle in the main chain, the anti degradation property can be improved.放射包含220 nm以下之波長帶之紫外線之放電燈，其目的在於抑制來自於在管體之外部引伸之絕緣導體的鹵化物之產生。在封入於220 nm以下之波長帶發光之物質而成之放電燈上，使用由非鹵系之絕緣體包覆之絕緣導體，來作為於管體之外部引伸之絕緣導線。於絕緣體為主鏈中具有芳香環及/或雜環之高分子化合物之情形時，可改善抗劣化性。
