<p>An ionic liquid that can widely be used as materials of various electrical devices and as solvents for various reactions, exhibiting hydrophobicity causing phase separation from water; and a process for producing the same. There is provided an ionic liquid comprising at least one anion selected from the group consisting of fluoroalkylsulfate anions, fluorocycloalkylsulfate anions and fluorobenzylsulfate anion, which ionic liquid exhibits hydrophobicity causing phase separation from water. The concentration of halide ions contained in this ionic liquid can be <= 70 ppm.</p>
