An in-vehicle device displaying travel lanes of a vehicle in a predetermined number of display boxes includes an identifying part that identifies travel lanes to be displayed in the display boxes, and identifies travel lanes so a recommended lane which is a travel lane recommended for the vehicle to travel is displayed in one of the display boxes and a maximum number of recommended travel lanes which are travel lanes coinciding with a traveling direction of the recommended lane each are displayed in one of the display boxes; and a display part that displays the identified travel lanes in the display boxes. The identifying part identifies travel lanes while relatively shifting in turn a plurality of travel lanes and the display boxes from a travel lane at one end of the plurality of travel lanes that are on a traveling direction side of the vehicle and being adjacent to each other.