To provide a cover glass for a solid-state imaging device, which has a high Young's modulus and a thermal expansion coefficient close to silicon within a wide temperature range and which is useful particularly for a solid-state imaging device produced by CSP.A cover glass for a solid-state imaging device, which comprises, by mass %, from 56 to 66% of SiO2, from 9 to 26% of Al2O3, from 1 to 11% of B2O3, from 0 to 6% of MgO, from 0 to 6% of CaO, from 4 to 13% of ZnO, from 0 to 4% of Li2O, from 0 to 5% of Na2O, and from 0 to 6% of K2O, provided that Li2O+Na2O+K2O is at least 1%, and which has an average thermal expansion coefficient of from 30 to 38×10−7K−1 within a range of from 30 to 300° C. and a Young's modulus of at least 78 GPa.