A digital still camera, composed of a lens barrel having therein a camera lens, whose optical axis is close to a center of the digital still camera, an imaging element arranged on an image forming point of the camera lens, perpendicularly to the optical axis of the camera lens, for receiving an image of a subject taken through the camera lens, and an image display device arranged on a side of the imaging element, on a back side of the digital still camera, for displaying the image taken by the imaging element through the camera lens, wherein a concave section for housing one side portion of the image display device is formed in the lens barrel from a peripheral surface of the lens barrel to an inside of the lens barrel, perpendicularly to the optical axis.