A travel support device includes a planner, an information generator, and a traffic information obtaining unit. To each of a plurality of sections into which a travel route from the current location to the destination is divided, the planner is adapted to assign, based on a road load associated with each section, a travel mode among a first mode, in which a remaining energy charge of the battery of the vehicle is not maintained, and a second mode, in which the remaining energy charge of the battery is maintained. When traffic congestion information is acquired by the traffic information obtaining unit, the information generator is adapted to set a traffic congestion road load, which is a fixed road load, for a section in which the traffic congestion is occurring.