A device for calculating one or more camera parameters of a camera mounted on a vehicle for converting a scenery image captured by the camera of a scenery including a road on which the vehicle moves into an image for navigation by which the vehicle is guided to a destination, the one or more camera parameters representing a height (h) of a mount position of the camera with respect to the vehicle and a direction of the camera with respect to the vehicle, the device comprising: a road width information acquisition unit that acquires road data corresponding to the current location based on location information and acquires road width information relating to a width of the road on which the vehicle moves at a current location from the road data; a scenery image acquisition unit that acquires the scenery image from the camera; and a camera parameter calibration unit that performs calibration calculation of the camera parameters based on the scenery image and the road width information; the device characterized in further comprising a location information acquisition unit that acquires the location information about the current location of the vehicle; a prediction image creation unit that creates a prediction image of the scenery based on the location information and the road data acquired by the road width information acquisition unit and extracts a first feature part included in the prediction image; a first conversion unit that creates a first scenery conversion image by converting coordinates of the scenery image based on the camera parameters; a feature extraction unit that extracts a second feature part from the first scenery conversion image by image processing calculation; and a similarity determination unit that determines whether or not the first feature part acquired by the prediction image creation unit is similar to the second feature part acquired by the feature extraction unit, wherein if the similarity determination unit determines that the first feature part is dissimilar to the second feature part, the camera parameter calibration unit performs calibration calculation of the camera parameters. a road width information acquisition unit that acquires road data corresponding to the current location based on location information and acquires road width information relating to a width of the road on which the vehicle moves at a current location from the road data; a scenery image acquisition unit that acquires the scenery image from the camera; and a camera parameter calibration unit that performs calibration calculation of the camera parameters based on the scenery image and the road width information; the device characterized in further comprising a location information acquisition unit that acquires the location information about the current location of the vehicle; a prediction image creation unit that creates a prediction image of the scenery based on the location information and the road data acquired by the road width information acquisition unit and extracts a first feature part included in the prediction image; a first conversion unit that creates a first scenery conversion image by converting coordinates of the scenery image based on the camera parameters; a feature extraction unit that extracts a second feature part from the first scenery conversion image by image processing calculation; and a similarity determination unit that determines whether or not the first feature part acquired by the prediction image creation unit is similar to the second feature part acquired by the feature extraction unit, wherein if the similarity determination unit determines that the first feature part is dissimilar to the second feature part, the camera parameter calibration unit performs calibration calculation of the camera parameters.