A production method of a fatty acid chloride comprising performing the following Step 1, Step 2 and Step 3 in this order: Step 1: a step of reacting a fatty acid having from 8 to 22 carbon atoms with from 1/3 to 2/3 molar equivalent of phosphorus trichloride relative to the fatty acid to prepare a fatty acid chloride, and separating, by standing, a layer containing phosphorous acid produced as a by-product to obtain a reaction product; Step 2: a step of purifying the reaction product obtained in the Step 1 so as to set a phosphorus content of the phosphorous acid by-produced to 0.20% by weight or less; Step 3: a step of adding from 0.03 to 0.07% by weight of phosphorus trichloride in terms of a phosphorus content to the purified product obtained in the Step 2, wherein in the Step 2, the purification is performed by treating the reaction product obtained in the Step 1 at a temperature from 80 to 230°C and under a pressure from 133.3 × 10 -1 to 133.3 × 10 1 Pa using a thin film distiller to distil away the phosphorus trichloride in the reaction product outside a system and to evaporate the fatty acid chloride and condense the fatty acid chloride by an internal condenser, thereby separating the phosphorous acid produced as a by-product which is a non-evaporative component, or wherein in the Step 2, the purification is performed by treating the reaction product obtained in the Step 1 at a temperature from 40 to 90°C and under a pressure from 133.3 × 10 -1 to 133.3 × 10 1 Pa using a thin film distiller to distil away the phosphorus trichloride in the reaction product outside a system without evaporating the fatty acid chloride, thereby removing the phosphorous acid produced as a by-product dissolved in the phosphorus trichloride together with the distillation away of the phosphorus trichloride from the fatty acid chloride, wherein the phosphorus content is measured in accordance with the conditions as described in the description. Step 1: a step of reacting a fatty acid having from 8 to 22 carbon atoms with from 1/3 to 2/3 molar equivalent of phosphorus trichloride relative to the fatty acid to prepare a fatty acid chloride, and separating, by standing, a layer containing phosphorous acid produced as a by-product to obtain a reaction product; Step 2: a step of purifying the reaction product obtained in the Step 1 so as to set a phosphorus content of the phosphorous acid by-produced to 0.20% by weight or less; Step 3: a step of adding from 0.03 to 0.07% by weight of phosphorus trichloride in terms of a phosphorus content to the purified product obtained in the Step 2, wherein in the Step 2, the purification is performed by treating the reaction product obtained in the Step 1 at a temperature from 80 to 230°C and under a pressure from 133.3 × 10 -1 to 133.3 × 10 1 Pa using a thin film distiller to distil away the phosphorus trichloride in the reaction product outside a system and to evaporate the fatty acid chloride and condense the fatty acid chloride by an internal condenser, thereby separating the phosphorous acid produced as a by-product which is a non-evaporative component, or wherein in the Step 2, the purification is performed by treating the reaction product obtained in the Step 1 at a temperature from 40 to 90°C and under a pressure from 133.3 × 10 -1 to 133.3 × 10 1 Pa using a thin film distiller to distil away the phosphorus trichloride in the reaction product outside a system without evaporating the fatty acid chloride, thereby removing the phosphorous acid produced as a by-product dissolved in the phosphorus trichloride together with the distillation away of the phosphorus trichloride from the fatty acid chloride, wherein the phosphorus content is measured in accordance with the conditions as described in the description. a step of adding from 0.03 to 0.07% by weight of phosphorus trichloride in terms of a phosphorus content to the purified product obtained in the Step 2, wherein in the Step 2, the purification is performed by treating the reaction product obtained in the Step 1 at a temperature from 80 to 230°C and under a pressure from 133.3 × 10 -1 to 133.3 × 10 1 Pa using a thin film distiller to distil away the phosphorus trichloride in the reaction product outside a system and to evaporate the fatty acid chloride and condense the fatty acid chloride by an internal condenser, thereby separating the phosphorous acid produced as a by-product which is a non-evaporative component, or wherein in the Step 2, the purification is performed by treating the reaction product obtained in the Step 1 at a temperature from 40 to 90°C and under a pressure from 133.3 × 10 -1 to 133.3 × 10 1 Pa using a thin film distiller to distil away the phosphorus trichloride in the reaction product outside a system without evaporating the fatty acid chloride, thereby removing the phosphorous acid produced as a by-product dissolved in the phosphorus trichloride together with the distillation away of the phosphorus trichloride from the fatty acid chloride, wherein the phosphorus content is measured in accordance with the conditions as described in the description.