A process for producing triaryl phosphate, comprising reacting at least one specific aromatic hydroxy compound with phosphorus pentachloride to form a chlorophosphorane compound and reacting water, an alcohol, an alcohol aqueous solution or an alkaline aqueous solution with the chlorophosphorane compound. The process permits the production of triaryl phosphate at high yields at a low temperature for a relatively short period of time, making the removal and treatment of a catalyst simply and obviating the use of the catalyst in some cases.