An imaging device comprises an imaging section for outputting image data every set time, in association with commencement of a bulb exposure; an adding processing section for, every time new image data is output from the imaging section, generating an added image by adding images that were output after commencement of the bulb exposure; an image display section for displaying each generated added image; and a sound generating section for performing sound generation in response to update of the image display section when a display update interval of the image display section is at least a specified time.