A high-pressure discharge lamp includes an arc tube portion enclosing a luminous material in the tube; a side tube portion substantially made of quartz glass that extends from the arc tube portion; and an electrode rod whose first end is arranged in the arc tube portion and a part of which is provided in the side tube portion. The electrode rod is substantially made of tungsten. A region containing at least one of copper oxide and copper is present in at least a part of the portion of the side tube portion in which the part of the electrode rod is positioned.