To provide an alkali-free glass excellent in the properties for glass substrates to be used for display, excellent in the resistance to reduction, and suitable for forming by a float process. An alkali-free glass consisting essentially of, as represented by mol %: SiO2at least 60% and less than 66%,Al2O30 to 12%,B2O35 to 10%,MgO0 to 18%,CaO0 to 18%,SrO0 to 18%,BaO0 to 6%, CaO + SrO10 to 25%, MgO + CaO + SrO + BaO15.5 to 30% and containing substantially no alkali metal oxide.