Ionic liquids (ILs) were fixed into polyether-based polyurethane (PU) films for sustainable antistatic properties. Preliminarily, ILs were screened in terms of efficiency of antistatic effect. Surface resistivity (ρ_s) for IL-doped PU films changed depending the anion species, and the smallest ρ_s was found for the PU films containing bis(trifluoromethanesulfonyl)imide ([Tf₂N])-type ILs. Then, [Tf₂N]-type ILs composed of ammonium cations having hydroxyl groups were fixed into the PUs through urethane bonds. The fixation of 1000 ppm of the ILs reduced the ρ_s of the PU films from 2.1 × 10¹² to 2.1 × 10⁹ Ω sq^?1. These IL-fixed PU films were revealed to possess high washing durability confirmed by negligible change of ρ_s before and after ultra-sonication treatment in methanol.