TRAVELING SUPPORT DEVICE

A traveling support device is applied to a vehicle equipped with an imaging device and performs a traveling support control on an own vehicle based on an image captured by the imaging device. The traveling support device includes: a recognizer that recognizes, based on the image, a forward object located ahead of the own vehicle in a direction of travel and a boundary portion located on each of left and right sides of a road on which the own vehicle is traveling; an angular width calculator that calculates an object point, which indicates a predetermined portion of the forward object, and a boundary point, which is on the boundary portion, on one line extending along the width of the own vehicle in the image and calculates, for the object point and the boundary point, an angular width based on an origin defined in the image; an obtainer that obtains distance information indicating a distance to the predetermined portion of the forward object; a lateral distance calculator that calculates, based on the angular width calculated by the angular width calculator and the distance information, a lateral distance between the predetermined portion of the forward object and the boundary portion along the width of the own vehicle; and a controller that performs the traveling support control to the forward object based on the lateral distance.