NOVELTY - Acid fluoride derivative (2) is thiocarboxylated and thiosulfonated to produce thiosulfonic acid thiocarboxylic acid compound (3). De-sulfo carbonyl reaction of the thiosulfonic acid thiocarboxylic acid compound is carried out to obtain vinyl ether of thiosulfonic acid compound (4). Obtained vinyl ether of thiosulfonic acid compound is fluorinated to produce fluorine-containing fluoro sulfonyl alkyl vinyl ether (1).    USE - For manufacturing fluorine-containing fluoro sulfonyl alkyl vinyl ether used as monomer component for polymers used for electrolyte film or ion exchange membrane of solid polymer electrolyte type fuel cell, film for lithium cell, film for brine electrolysis, film for water electrolysis, film for hydrohalic acid electrolysis and film for oxygen enricher, humidity sensor and gas sensor.    ADVANTAGE - The fluorine-containing fluoro sulfonyl alkyl vinyl ether is manufactured economically with a high yield rate, using a simple process.    DETAILED DESCRIPTION - Acid fluoride derivative is thiocarboxylated and thiosulfonated to produce thiosulfonic acid thiocarboxylic acid compound. De-sulfo carbonyl reaction of the thiosulfonic acid thiocarboxylic acid compound is carried out to obtain vinyl ether of thiosulfonic acid compound. Obtained vinyl ether of thiosulfonic acid compound is fluorinated to produce fluorine-containing fluoro sulfonyl alkyl vinyl ether of formula: CF2=CFO(CF2CF(CF3)O)nCF2CF2SO2F, where n is 0-10. The acid fluoride derivative is of formula (2): FCOCF(CF3)O(CF2CF(CF3)O)nCF2CF2SO2F, thiosulfonic acid thiocarboxylic acid compound is of formula (3): R1SCOCF(CF3)O( CF2CF(CF3)O)nCF2CF2SO2SR2 and the vinyl ether of thiosulfonic acid compound is of formula (4): CF2=CFO (CF2CF(CF3)O)nCF2CF2SO2SR2.    R1,R2 = Ma, Mb1/2, alkyl group, alkenyl group, alkynyl group or aryl group;    Ma = alkali metal;    Mb = alkaline earth metal; and    n = 0-10.    INDEPENDENT CLAIMS are included for the following:    (1) thiosulfonic acid thiocarboxylic acid compound; and    (2) manufacture of thiosulfonic acid thiocarboxylic acid compound.