A scan representation position table to which three points of focus positions which become scan representation positions are recorded respectively is stored in advance based on the lens position of the zoom lens 2b and the type of priority focus.The current zoom lens 2b lens position is acquired and determination processing for short-distance priority focus or long-distance priority focus is performed when judged that the shutter button has been fully depressed at once or when the shutter button has been fully depressed before the passage of a predetermined time duration after the shutter button was halfway depressed. Then, the focus positions are acquired from the scan representation position table based on the acquired lens position and the judged priority focus, and the contrast AF processing is executed within the range of the acquired three points of focus positions.