Abstract: An image taking apparatus consisting of a main unit capable of image recording in at least one of a first recording mode in which an object image is focused by a focusing system onto an image reading device is photoelectrically read and a second recording mode in which the object image is focused by a focusing system onto a recording medium for image recording, and a sub unit detachably attachable to the main unit is used for the recording in the second recording mode, and, when it is attached to the main unit, it receives the light image of the object image from the main unit and executes recording in the second recording mode.