A method for producing a fluorine-containing organic compound represented by the formula (7): R--Fm (7) wherein R represents a substituted or unsubstituted saturated hydrocarbon group, or a substituted or unsubstituted aromatic group and m represents an integer satisfying the inequality: 1.ltoreq.m.ltoreq.n, which comprises reacting a fluorinating agent represented by the formula (1): ##STR00001## wherein R.sup.1 and R.sup.3 are the same or different, and represent an optionally substituted alkyl group, R.sup.2, R.sup.4 and R.sup.5 are the same or different, and represent a hydrogen atom or an optionally substituted alkyl group, x satisfies 0