Provided is a fluororesin long film that has high uniformity and does not deform when bonded to metal foil. A fluororesin long film including a fluororesin in which the number of unstable functional groups is less than 350 per 110.sup.6 carbon atoms, where a difference between each average film thickness in a travel direction at every 5 mm in a width direction and an average film thickness of entire surface is within 2 m.