An interchangeable lens system includes an interchangeable lens capable of communication between the interchangeable lens and a camera body. The interchangeable lens includes a camera identifying unit that identifies a camera body from information obtained by the communication between the interchangeable lens and the camera body. In response to a data transmitting request instruction transmitted from the camera body through the communication, the camera identifying unit converts reply data into a format adapted for the camera body on the basis of an identifying result of the camera identifying unit, and transmits the reply data.