1. An imaging device comprising: an image pickup device that performs main photographing of a still image in a response to an input of a photographing request, while performing moving image photographing for displaying a live view image; a recording device that records a currently photographed image that is taken at a main photographing by the image pickup device in a recording medium; an image extracting device that extracts a predetermined number of images that have been photographed in a past from the recording medium; an animation creating device that creates an animation for showing that a reduced image of the currently photographed image is added to a reduced image of a last photographed image by using the currently photographed image that is taken at the main photographing and reduced images of the predetermined number of the extracted images; a display device that displays the still image or the moving image; and a display control device that displays the animation created by the animation creating device each time the main photographing is performed, while displaying the live view image that has been photographed, by the image pickup device as a moving image on the display device, wherein the animation creating device creates an animation in which the reduced images of the past photographed images are displayed in a display region for first to (N−1)-th frames in a preset display region for N frames of reduced images in the display device, and the currently photographed image is gradually reduced and moved to be inserted in a display region for an N-th frame by using the currently photographed image that is taken at the main photographing as a background of the animation, wherein the display control device displays the reduced images of predetermined number of images that are extracted by the image extracting device in a preset display region for the N frames of reduced images on the display device, while displaying the live view image on the display device, and wherein the preset display region for N frames of reduced images on the display device is superimposed on a part of a display region where the live view image is displayed, and the N frames of the reduced images are superimposed on the live view image.