The present invention provides a structure having sufficiently high pressure resistance in an extra-high pressure mercury lamp lighted at an extremely high mercury vapor pressure. The short arc type extra-high pressure discharge lamp comprises an arc tube part, arranged with a pair of electrodes facing each other in an interior and sealing mercury of >=0.15 mg/mm<3>, and side tube parts extended on both sides of the arc tube part and sealing one parts of the electrodes. Minute voids are formed between outer surfaces of portions positioned in the side tube parts of the electrodes and quartz glass composing the side tube parts, and rugged parts are formed in the electrode portions. |