According to one embodiment, a sanitary washing device for washing human private parts includes a nozzle configured to jet water toward the human private parts, and a protective electronic circuit configured to prohibit operation of at least part of the sanitary washing device when a component of the sanitary washing device fails. The protective electronic circuit includes a failure diagnosis part configured to diagnose a failure of a component of the protective electronic circuit. At least part of the operation related to the jetting in the sanitary washing device is prohibited when a failure of the component of the sanitary washing device is sensed by diagnosis using the failure diagnosis part.