An adhesive composition comprising: - an acrylic block copolymer; and - a fluorine-based surfactant, wherein the acrylic block copolymer has a triblock structure represented by [A1]-[B]-[A2], and wherein the [A1] and the [A2] each being a polymer block having a glass transition temperature higher than 40 °C, the [B] being a polymer block having a glass transition temperature lower than 20 °C, the glass transition temperature of a polymer block being a value calculated from the FOX equation on the basis of glass transition temperatures of homopolymers of respective monomers that constitute the polymer block and the weight fractions of the monomers, and wherein the fluorine-based surfactant has a weight average molecular weight of not less than 3,000, the weight average molecular weight being a value in terms of polystyrene as determined by gel permeation chromatography, and wherein the ratio of fluorine atoms/carbon atoms, measured by X-ray photoelectron spectroscopy, on a surface of the adhesive composition that has been peeled off from an adherend after aging in a high-temperature and high-humidity environment is not less than 1.70 × 10 -1 . - an acrylic block copolymer; and - a fluorine-based surfactant, wherein the acrylic block copolymer has a triblock structure represented by [A1]-[B]-[A2], and wherein the [A1] and the [A2] each being a polymer block having a glass transition temperature higher than 40 °C, the [B] being a polymer block having a glass transition temperature lower than 20 °C, the glass transition temperature of a polymer block being a value calculated from the FOX equation on the basis of glass transition temperatures of homopolymers of respective monomers that constitute the polymer block and the weight fractions of the monomers, and wherein the fluorine-based surfactant has a weight average molecular weight of not less than 3,000, the weight average molecular weight being a value in terms of polystyrene as determined by gel permeation chromatography, and wherein the ratio of fluorine atoms/carbon atoms, measured by X-ray photoelectron spectroscopy, on a surface of the adhesive composition that has been peeled off from an adherend after aging in a high-temperature and high-humidity environment is not less than 1.70 × 10 -1 . wherein the acrylic block copolymer has a triblock structure represented by [A1]-[B]-[A2], and wherein the [A1] and the [A2] each being a polymer block having a glass transition temperature higher than 40 °C, the [B] being a polymer block having a glass transition temperature lower than 20 °C, the glass transition temperature of a polymer block being a value calculated from the FOX equation on the basis of glass transition temperatures of homopolymers of respective monomers that constitute the polymer block and the weight fractions of the monomers, and wherein the fluorine-based surfactant has a weight average molecular weight of not less than 3,000, the weight average molecular weight being a value in terms of polystyrene as determined by gel permeation chromatography, and wherein the ratio of fluorine atoms/carbon atoms, measured by X-ray photoelectron spectroscopy, on a surface of the adhesive composition that has been peeled off from an adherend after aging in a high-temperature and high-humidity environment is not less than 1.70 × 10 -1 . <EOS>