1. An imaging device that captures a subject, generates image data of the subject, captures a moving image, and captures a still image during moving image capturing including directly after moving image capturing end, the device comprising: a moving image special effect image processing unit that performs image processing of applying a first special effect causing a visual effect over a plurality of frames corresponding to image data of a moving image, and image processing of applying a second special effect corresponding to the first special effect to a still image captured during moving image capturing using image data of a moving image captured before the still image; and a control unit that controls an application form of the first and second special effects in the moving image special effect image processing unit, wherein the moving image special effect image processing unit includes a resizing processing unit that performs resizing processing of approximating the number of pixels of image data of a moving image captured before the still image to the number of pixels of image data of the still image, and the moving image special effect image processing unit synthesizes the image data of a moving image which has been subjected to resizing processing by the resizing processing unit with the image data of the still image.