The present invention relates to a novel organic silane compound, and more particularly, to a novel organic silane compound, useful in various applications, for the purpose of improving the affinity of an organic resin to an inorganic filler or improving the adhesion of a coating layer comprising matrix resin to a substrate. It is particularly useful for improving the adhesion of a polarizing plate adhesive for a liquid crystal display to a glass substrate, with little change over time even under hot and humid conditions.