The fluorine-containing elastomer of claim 1, wherein the elastomer is a fluorine-containing multi-segment polymer having an elastomeric fluorine-containing polymer chain segment and a non-elastomeric fluorine-containing polymer chain segment; said elastomeric fluorine-containing polymer chain segment comprises 40 to 90% by mole of tetrafluorethylene, 10 to 60% by mole of perfluorovinylether repre