A lens apparatus can be easily set even in cases where the lens body and demands are distant from each other upon shooting without a decrease in reliability. A lens body mounted on a camera body is provided with a command signal converting unit, a time-series position signal converting unit, a wireless communication unit, a communication condition monitoring unit and a communication process switch unit. A signal converting unit, to which a zoom demand and a focus demand are connected, is provided with a time-series command signal converting unit, a position signal converting unit and a wireless communication unit. The lens body and the signal converting unit are configured to wirelessly communicate with each other to eliminate the use of connection cables, thereby improving operationality while enabling highly reliable wireless communication.