A laser discharge tube for preventing the flow out of an electrode material, deterioration of electrodes, and the like, caused by corona discharge, as well as for increasing power to be supplied to the laser discharge tube by improving the heat-dissipating property and insulating property of the electrodes. The laser discharge tube is a tube of a dielectric material (e.g., silica glass) with a circular cross section and two electrode units are helically disposed on the outside periphery thereof at the same pitch. The electrode units include electrodes and dielectric layers, respectively, and each of the electrodes is formed by depositing silver as an electric conductor on the outside periphery of the tube wall by metalizing. The dielectric layers are formed to cover the electrodes, respectively, and are disposed on the outside periphery of the tube wall by depositing a dielectric material such as a ceramic material, glass, resin or the like by spray coating, coating, baking or the like or by bonding independently formed dielectric materials to the electrodes. The dielectric layers have a thickness of about 0.1 mm-5 mm.