An electrolytic solution for electrochemical elements which comprises an anion ingredient having one or more fluorine atoms and a cation ingredient which is imidazolium or an imidazolium derivative each having one or more hydrogen atoms, and which has at least five fluorine atom/hydrogen atom pairs in each of which the distance between the fluorine atom of the anion ingredient and the hydrogen atom of the cation ingredient is 2.7 AA or shorter. For example, the ionic association compound (I) shown below has been formed in the solution. This electrolytic imidazolium solution shows a higher withstand voltage than conventional electrolytic solutions containing 1,3,4,5-tetramethylimidazolium.