An image-pickup device including an image-pickup element converting an optical image of a subject into an electrical signal is provided. The image-pickup device includes a detection unit which detects brightness of the subject, a first determination unit determining an exposure-time period on the basis of the detected brightness, a second determination unit determining a divided-time period used for dividing the exposure-time period into a plurality of sections, an image-pickup-timing-control unit which divides the exposure-time period by the divided-time period, exposes the image-pickup element a plurality of times, and generates a plurality of time-division-image data items, and a combining unit which generates still-image data by combining the generated time-division-image data items with each other.