A supported resin substrate comprises a supporting substrate, a release layer arranged on the supporting substrate and containing a metal or a metal oxide, and a resin substrate arranged on the release layer, the resin substrate including a front surface region opposite the release layer and a rear surface region in contact with the release layer. The resin substrate consists essentially of a resin material containing elemental fluorine. The ratio of the compositional proportion of fluorine in the rear surface region of the resin substrate to that in the front surface region of the resin substrate is 0.45 or less.