A cross-linked fluorine-containing copolymer moldings applicable to a plasma irradiation step, which is molded as a peroxide cross-linking product of a fluorine-containing copolymer blend comprising a fluorine-containing elastomer copolymer and a fluorine-containing resin copolymer, which is a vinylidene fluoride-tetrafluoroethylene copolymer, both of the copolymers having reaction sites capable of reacting with a common peroxide-based cross-linking agent, respectively, has desired normal state physical properties and compression set value, even if applied to a plasma irradiation step, while reducing particle generation quantity of the fluorine-containing copolymers themselves.