1. An imaging device that supports taking of an image with a suitable composition in accordance with a golden ratio, the imaging device comprising: an imaging mechanism operable to generate an image from incident light to satisfy a first imaging control condition; a storage unit storing at least one piece of region information each of which indicates a boundary region located, in an image frame, between two golden section lines determined by two types of golden ratios; a detection unit operable to detect one or more face regions, which are recognized as face portions of imaging objects, from the image generated by the imaging mechanism; a weighting unit operable to, when the detection unit has detected a plurality of face regions, assign weights to each of the detected face regions depending on overlapping of each face region with the boundary region indicated by the region information, and obtain an evaluation value of each of the face regions; a selection unit operable to select one face region as a face portion of a main imaging object from among the plurality of face regions, in accordance with the evaluation value of each of the face regions; and an imaging control unit operable to control the imaging mechanism to generate an image to satisfy a second imaging control condition that is determined according to the selected face region.