Adhesive composition, adhesive sheet and bonded body

The present invention relates to an adhesive composition which contains at least a polymer and an ionic liquid, and which is configured such that if an adhesive layer is formed from the constituents of the composition other than the ionic liquid and subsequently left to stand for three days in an environment at 22°C at 20%RH, the relative dielectric constant of the adhesive layer at the frequency of 100 Hz is 5 or more.