An AF section receives a reflected light beam from the subject. A CPU calculates a distance to the subject based on an output of the AF section. An underwater detecting section optically determines that the camera lies in the water. A transparency detecting section evaluates the degree of muddiness of the surrounding water when the camera lies in the water. A focusing section sets the focusing position of the photographing lens of the camera based on an output of the CPU and an output of the transparency detecting section when the underwater detecting section has determined that the camera lies in the water.