Discharge lamp electrodes, the high-pressure discharge lamp, a lamp unit and a projection-type image display device

For the purpose of preventing breakage of the sealing part and the electrode of the high-pressure discharge lamp, one end is sealed in the sealing portion of the arc tube of the discharge lamp, the rod-shaped other end of which is arranged in the discharge space of the arc tube part a discharge lamp electrode (100) having a respective crystal grains having a crystal orientation different on the surface of the rod-shaped portion (101) there is a plurality, and the crystal grains are present by the difference in the crystal orientation by surface state of the region are different, the discharge lamp electrode surface configurations irregularities are formed of the rod-shaped portion (101) (100).