An adhesive composition of the present invention is characterized by including: an acrylic copolymer (A) containing 30 to 77% by weight of a structural unit (a1) derived from an alkyl acrylate monomer in which an alkyl group has 5 to 20 carbon atoms; 20 to 60% by weight of a structural unit (a2) derived from an alicyclic group-containing (meth)acrylate monomer; 0.01 to 5% by weight of a structural unit (a3) derived from a tertiary amino group-containing monomer that is derived from (meth)acrylic acid; and 0.1 to 10% by weight of a structural unit (a4) derived from a monomer containing a functional group excluding tertiary amino groups, and a crosslinking agent (B),According to the present invention, it is possible to provide an adhesive composition capable of allowing the crosslinking reaction with a crosslinking agent to proceed smoothly and also shortening the period for stabilizing the adhesive composition without the use of heavy metals whose adverse impacts on the environment are concerned, while achieving a sufficient level of adhesion strength to an adherend regardless of the degree of the surface polarity thereof.