An on-vehicle radar apparatus includes a printed circuit board in which at least one radar antenna pattern unit is mounted on a first surface thereof, a case, a cover, and a connector receiving portion. In a situation that a first connector is mounted on the printed circuit board such that a first terminal forms a first angle with respect to a first surface of the printed circuit board, the connector receiving portion receives the first connector to be exposed from the case. In a situation that a second connector is mounted on the printed circuit board such that a second terminal forms a second angle with respect to the first surface of the printed circuit board, the connector receiving portion receives the second connector to be exposed from the case.