To provide a process for producing a fluorinated crosslinked product which is excellent in stability and produces less HF.A process for producing a fluorinated crosslinked product, which comprises irradiating a fluorinated polymer having a unit represented by the following formula (1), with active energy rays having a wavelength of from 150 to 300 nm: wherein X1 and X2 are each independently a hydrogen atom or a fluorine atom, Rf1 is a fluoroalkylene group or a fluoroalkylene group having at least two carbon atoms and an etheric oxygen atom between carbon-carbon atoms, Q1 is a single bond or an etheric oxygen atom, and Z1 is OH, OR1 or NR2R3, wherein R1 is an alkyl group, and R2 and R3 are each independently a hydrogen atom or an alkyl group.