A traveling control apparatus to be applied to a vehicle includes a traveling controller, a traveling environment recognizer, a target traveling course setting section, a steering assist controller, a target traveling course switching section, and an own-vehicle position and own-vehicle traveling course estimator. The own-vehicle position and own-vehicle traveling course estimator estimates a first lateral position of the vehicle, an estimated traveling course along which the vehicle is to travel after start of a lane change control, and a second lateral position of the vehicle to be reached after the vehicle travels for a predetermined time period from the first lateral position. The target traveling course switching section regards the vehicle as traveling within an adjacent lane, and switches a target traveling course from within a traveling lane to within the adjacent lane, if the two lateral positions are determined as each satisfying a relationship with a predetermined threshold.