Adhesive composition

An adhesive composition according to one embodiment of the present invention contains a block copolymer comprising a polymer block A, a polymer block B, and a polymer block C. The polymer block A contains a (meth) acrylate unit having a linear or branched side chain having 1-8 carbon atoms and has a number average molecular weight of 2,000-10,000, and the polymer block C contains a (meth) acrylate unit having a linear or branched side chain having 1-8 carbon atoms. The polymer block B contains at least one of an aromatic vinyl compound unit and a (meth) acrylate unit having a cyclic structure, and the polymer block C contains a (meth) acrylate unit having a linear or branched side chain having 1-8 carbon atoms; the mass ratio (B/C) of the polymer block B to the polymer block C is in the range of 5.0/95.0-30.0/70.0, the mass ratio (A/(B + C)) of the polymer block A to the total of the polymer block B and the polymer block C is in the range of 0.1/99.9-5.0/95.0, and the acid value of the block copolymer is 8 mg