Pellicle and novel fluoropolymer

A useful fluoropolymer excellent in transparency and durability to a short wavelength light (an ArF excimer laser having an irradiation wavelength of 193 nm and a F2 excimer laser having an irradiation wavelength of 157 nm) as e.g. a pellicle material, wherein a polymer (I) to be used for a pellicle membrane and/or an adhesive is a polymer essentially containing the following fluorine atom-containing unit (1), wherein a chain forming the polymer main chain comprises a carbon atom and an etheric oxygen atom, at least one carbon atom forming the main chain is a carbon atom forming a cyclic group, and at least one etheric oxygen atom forming the main chain is an oxygen atom forming no cyclic group.