A camera having a camera-blur warning function which is adapted to switch between executing a camera-blur detecting mode and stopping the camera-blur detecting mode by the setting of a camera strobe mode. In a photographing scene where occurrence of a camera-blur is on a user's mind, a camera-blur detecting mode is set, thereby to detect vibration. In case any camera-blur occurs, warning is made so that the user may recognize it. Furthermore, at the time of determining holding, a conventional optical sensor which is already mounted as a sensor for measuring distance is utilized for determining the camera-blur.