A process for producing a fluorinated vinyl ether through a simple procedure in high yield from a fluorinated acid fluoride compound having an ester group, which is a precursor for a carboxy group, or an SO 2 F group, which is a precursor for a sulfo group. The process comprises thermally decomposing a carboxylic acid potassium salt having a specific structure represented by the following formula in the absence of a solvent and/or while keeping the salt in a solid state. (1) (In the formula, X is −CO 2 R or −SO 2 F and R is alkyl.)