An automatic focusing device of the present invention forecasts the future position of the photographic object accurately. The device includes an object focusing position change velocity calculation device, which calculates the object focusing position change velocity of the object, and an object focusing position change velocity ratio calculation device, which calculates the ratio of the object focusing position change velocity as sequentially calculated by the object focusing position change velocity calculation device. An object focusing position change acceleration calculation device calculates the object focusing position change acceleration from the object focusing position change velocity calculation device, and the forecast means forecasts the movement of the future object. A revision device revises the acceleration calculated by the object focusing position change acceleration calculation device according to the velocity ratio calculated by the object focusing position change velocity ratio calculation device. The forecast device is controlled based on this revised object focusing position change acceleration.