1. A digital camera comprising: an image sensor which captures an object image via a photographing lens; a display device which displays a through-the-lens display of an object image that is captured by said image sensor; an autofocus adjuster which detects a focal state based on said object image captured by said image sensor and brings a specified object image into an in-focus state, based on the detected focal state, by moving a focal-adjusting lens group of said photographing lens in the optical axis direction thereof; a lens detector which detects whether or not said photographing lens is a specific-function photographing lens that is provided with a manual operational member which moves said focal-adjusting lens group via a manual operation independent from said autofocus adjuster, wherein, said lens detector detects that said photographing lens is said specific-function photographing lens; and a distinguishing-display controller carries out image processing on said at least a part of said specified object image, whereby said specified object image is displayed on said display device in a distinguished manner from the other object images.