1. An electronic still camera comprising: a photography mode selecting section allowing a photographer to select continuous photographing; an imaging section capturing an image of a subject; an area setting section detecting a photographic subject based on a photographic image captured by the imaging section for every photograph in a continuous photographing mode, setting a photographic subject area including the detected photographic subject, and dividing an area outside of the photographic subject area of the photographic image into an exclude area and a non-exclude area based on luminance information of the photographic image, when the continuous photographing is selected by the photography mode selecting section; and a memory section storing an image inside the photographic subject area and the non-exclude area as a photographic subject image.