In order to prevent the ingress of moisture into a void section of a component main body of a ceramic electronic component, at least the component main body of the ceramic electronic component is provided with water repellency using a water repellent agent. The water repellent agent is dissolved in a supercritical fluid such as, a supercritical CO2 fluid, as a solvent to provide at least the component main body with water repellency. After providing the water repellency, the water repellent agent on the outer surface of the component main body is removed. As the water repellent agent, a silane coupling agent may be used.