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(57) [abstract] (with correction) [PROBLEMS] To maintain excellent adhesiveness even under conditions of high temperature and high humidity, do not generate foaming or peeling due to dimensional change, and also occur due to expansion and contraction of a polarizing plate layer. A pressure-sensitive adhesive composition for a polarizing plate that relieves stress concentration and does not cause color unevenness or white spots on a liquid crystal element. A (meth) acrylic acid alkyl ester monomer (a) is used in an amount of 90 to 99.8% by weight and a carboxyl group- and / or hydroxyl group-containing unsaturated monomer (b) in an amount of 0.2 to 10% by weight. Weight average molecular weight of 1,000,000 to 20 The weight average molecular weight obtained by copolymerizing a monomer mixture consisting of the copolymers (A), (a) and (b) having a molecular weight of 10,000 is 30,000- 300,000, a copolymer (B) containing less than 2 (b) per molecule of the (co) polymer, having a weight average molecular weight of 1, 000-20,000 and a non-functional alkyl (meth) acrylate (co) polymer (C) having a dispersity (MW / MN) of 1.0-2.5 and a crosslinking agent (D) An adhesive composition for polarizing plates comprising: |