An interchangeable lens type camera system in which an intermediate accessory is removably attached between a camera body and a lens barrel includes a first CPU provided in the camera body, a second CPU provided in the intermediate accessory, and a third CPU provided in the lens barrel. The first CPU supplies a reset signal to the second CPU in association with attachment of the intermediate accessory, and the second CPU receives the reset signal supplied from the first CPU and supplies the reset signal to the third CPU.