To provide a driving support device that, when a vehicle approaches signs arranged in the vicinity of a plurality of roads, provides information of a sign that targets at a road on which the vehicle travels, and suppresses provision of information of a sign that does not target at the road on which the vehicle travels.The driving support device of the present invention includes: sign recognition means for detecting a sign from a video acquired from an imaging device mounted to a vehicle that travels on a road, and recognizing information represented by a detected sign that is the sign detected and a first relative position that is a relative position of the detected sign to the road; map data storage means for storing a second relative position that is a relative position of the sign to the road; sign position determination means for determining conformity of the detected sign and a map sign that is the sign whose second relative position the map data storage means stores by determining if the second relative position and the first relative position conform; and output means for outputting the information that the detected sign represents, when it is determined that the detected sign and the map sign conform.