A light distribution switching device of a head lamp may include: a housing installed at the front of a light source of the head lamp; a shield part rotatably installed in the housing, and adjusting movement of light irradiated from the light source depending on a rotational position; a rotating gear mounted on the shield part and rotated with the shield part; a driving part rotating a driving gear engaged with the rotating gear; and an elastic return part installed on the shield part, and moving the shield part to the original position when the driving part is stopped.