Provided is a communicating device including plural communicating units each communicates with another communicating device via a wireless communication path, a casing that supports the plural communicating units such that the plural communicating units respectively receive radio signals arriving from directions relatively different from each other, and a communication control section that controls operation of each of the plural communicating units, the communication control section performing control such that priority is given to reception of a radio signal by a target communicating unit among the plural communicating units and controlling execution of processing related to diagnosis of communicating unit in question, on basis of a result of the reception.