A method of manufacturing an arc tube for a discharge lamp device. The method comprises: inserting a first electrode assembly having an electrode, a molybdenum foil and a molybdenum lead wire connected integrally in series from a first open end of a glass pipe for the arc tube having a swollen chamber portion formed in a middle part in a longitudinal direction such that a tip of the electrode of the first electrode assembly is protruded into the chamber portion; introducing an antioxidant gas from a second open end of the glass pipe into the glass pipe; inserting the first open end of the glass pipe into a gas chamber to which the antioxidant gas is to be supplied; and pinch-sealing a first region including the molybdenum foil of the first electrode assembly in the glass pipe for a primary pinch seal with holding the first open end of the glass pipe in an antioxidant gas atmosphere.