A target determination apparatus mounted in a vehicle includes a first relative speed acquisition device configured to acquire a relative speed of a target forward of the vehicle with respect to the vehicle as a first relative speed using a millimeter-wave radar, a second relative speed acquisition device configured to acquire a relative speed of the target with respect to the vehicle as a second relative speed using a lidar, and a determination device configured to, in a case where the difference between the first relative speed and the second relative speed exceeds a threshold, determine the target as an upper structure located above the height of the vehicle.