According to the present invention, there is provided an imaging device, comprising: an imaging unit for receiving subject light flux, that has been made incident by the photographing lens, on an imaging surface, and photoelectrically converting a formed subject image to output image data; a display unit for carrying out a live view display operation using image data acquired by the imaging unit; a first contrast AF unit for obtaining contrast information of the subject information from image data acquired by the imaging unit and guiding the photographing lens into a first in-focus permissible range based on the contrast information, and a control unit for, when the live view display operation has started, executing a focus adjustment operation using the first contrast AF unit at a first time interval.