An automatic focus adjustment method for transmitting, from a camera main body side to a lens side, a driving amount of a focus operation member configured to drive a lens, the automatic focus adjustment method includes, when a driving amount according to defocus of an object is transmitted, transmitting a driving permissible time of the focus operation member according to a control method of automatic focus adjustment as well. On the camera main body side, the driving permissible time is acquired according to the set control method of the automatic focus adjustment. On the lens side, drive control of the focus operation member is switched so that a driving time of the focus operation member satisfies the driving permissible time.