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特許 係属中 PROBLEM TO BE SOLVED: To provide a method for producing a bulky gallium oxide single crystal having excellent light transmittance, in which the wavelength at the fundamental absorption end is the range of 250 to 260 nm and the internal transmittance is >=80% in the wavelength region (ultraviolet region and visible light region) of 310-620 nm in the thickness of 0.4 mm.