An interchangeable lens that is detachably fitted to a camera body includes: a photographic optical system including a plurality of driven members whose driven state changes; a driven position information transmission unit that transmits driven position information to the camera body via a first transmission unit according to a clock signal input from the camera body, the driven position information being related to a position of at least one driven member among the plurality of driven members; and a type information transmission unit that transmits type information to the camera body via a second transmission unit that is different from the first transmission unit, the type information specifying a type of driven position information that can be transmitted from the driven position information transmission unit.