The present invention can easily acquire images having a uniform aspect ratio. In an imaging device of the invention, a control section detects the movement amount and the movement direction of the imaging device based on output from an acceleration sensor. Then, when the movement direction of the imaging device in its initial movement started at the beginning of imaging is substantially linear and a substantially horizontal or vertical direction, the control section calculates a reference movement amount by which a composite image having a predetermined aspect ratio can be generated, based on the movement amount of the imaging device, and controls the display section to display imaging area information (guide) indicating the final imaging area having the predetermined aspect ratio based on the reference movement amount.