In order to solve a problem in which a stable and continuous photographing operation cannot be realized, for example, the continuous photographing operation stops irregularly or the like in an imaging device, the imaging device includes imaging means for generating image data, a first buffer for storing the image data, and control means for controlling an interval of photographing by the imaging means to maintain a constant or according to a continuous function which decreases monotonically with respect to a remaining capacity of the first buffer.