To provide a glass plate for a substrate, which contains no B2O3 and which can be used as a glass plate for an LCD panel.
A glass plate for a substrate, which contains substantially no B2O3, which comprises, as a glass matrix composition as represented by mass % based on oxide of SiO2: 68 to 80, Al2O3: 0.1 to 5, MgO: 9.5 to 12, CaO+SrO+BaO: 0 to 2, and Na2O+K2O: 12.5 to 15.5, and which has a density of at most 2.5 g/cm3, an average coefficient of thermal expansion from 50 to 350° C. of from more than 75×10−7/° C. to at most 87×10−7/° C., a glass transition point of at least 560° C. and a brittleness of at most 6.5 μm−1/2.