Navigation device and method for route calculation

A navigation device includes: a position detecting means; a remaining energy level detecting means; a storage means for storing map information including position information of a charging point of a drive energy; an energy consumption amount calculation means for calculating a consumption amount of the drive energy when a vehicle travels along any link included based upon the map information; a route calculation means for calculating a route from a current position to a destination point; and a route guidance means. The route calculation means calculates a recommended route with a minimum attainment cost among routes in which the remaining level does not fall below a predetermined threshold level based upon the map information, the remaining level on departure of the vehicle detected by the remaining energy level detecting means, and the consumption amount calculated by the energy consumption amount calculation means.