The no alkali glass exhibits excellent characteristics as a glass substrate for use in a display and is excellent in the resistance to reduction and further is suitable for forming by the float process. A no alkali glass which has a substantial chemical composition, in mole %, that SiO2: 60 % or more and less than 66 %, Al2O3: 0 to 12 %, B2O3: 5 to 10 %, MgO: 0 to 18 %, CaO: 0 to 18 %, SrO: 0 to 18 %, BaO: 0 to 6 %, with the proviso that CaO+SrO 10 to 25 %, and MgO+CaO+SrO+BaO 15.5 to 30 %, and which is substantially free of an alkali metal oxide.