An imaging device comprises an image sensor on which phase difference detection pixels are formed, a rapid shooting controller that carries out rapid shooting of still pictures by causing operation of the image sensor, and generates and stores image data based on image signals output by the image sensor, and a controller for focusing control that carries out the rapid shooting and causes operation of the image sensor between one exposure of the rapid shooting and the next to carry out first focus detection based on focus detection signals generated by the phase difference detection pixels, carries out second focus detection based on focus detection signals generated by the phase difference detection pixels as a result of the rapid shooting, and carries out focus adjustment based on results of the first focus detection and results of the second focus detection.