An imaging device includes an imaging unit, a first change amount calculating unit, and a second change amount calculating unit, and a control unit. The imaging unit continuously performs imaging to generate images of a plurality of frames of which the resolution is any one of a plurality of resolutions. The first change amount calculation unit calculates a first change amount that is an information change amount of the images of a plurality of frames. The second change amount calculation unit calculates a second change amount that is a temporal change amount of the first change amount. The control unit controls a resolution of the imaging unit on the basis of a result of comparing the second change amount with a threshold value and a result of discriminating a sign of the second change amount.
