The purpose of the present invention is to provide a glass sheet which can be effectively inhibited from warping through chemical strengthening and which enables polishing, etc., as treatments to be conducted before chemical strengthening, to be omitted or simplified. The invention relates to a glass sheet which, when analyzed with a secondary-ion mass spectrometer (SIMS), gives depth-direction profiles in which the abscissa is depth and the ordinate is F/Si intensity ratio, wherein the average value of the depth-direction profile in the depth range of 0-20 [mu]m of one surface is larger than the average value of the depth-direction profile in the depth range of 0-20 [mu]m of the other surface, the ratio of the two values being higher than 1.4.