To provide a radar sensor having a fine tuning function for reversing vehicle and enabling fine tuning of a sensing angle after installing it to the vehicle.

The radar sensor for the vehicle with the fine tuning function includes a base (10) forming a chamber pivotally receiving a sensor module (20). The sensor module (20) can adjust the wide field angle and a direction so as to set collectly the sensing range. A packing block (15) is set on the inner wall of the chamber, and can control by tuning components (14) set on the surface of the base (10). When an operator tunes the sensor module (20) at a proper angle, the tuning components (14) of the surface of the base (10) compresses the sensor so that the sensor module (20) is fixed at a desired position.