Provided is production of a resin film excellent in all of the folding resistance, the low water-absorption property, and the heat resistance. A resin film formed of a resin containing an alicyclic structure-containing polymer having crystallizability, the resin film having a folding endurance of 2,000 times or more, a water-absorption rate of 0.1% or less, and a heat-resistant temperature of 180°C or higher; a resin film formed of a resin containing an alicyclic structure-containing polymer having crystallizability, the resin film having a crystallinity degree of the alicyclic structure-containing polymer of 10% or more, a folding endurance of 2,000 times or more, and a water-absorption rate of 0.1% or less, and a smooth surface; and production method thereof.