Lighting device capable of controlling light radiation direction

A lighting apparatus of controlling a light radiation direction, the lighting apparatus including:

• a housing mounted with a light source configured to radiate light;
• a lens unit mounted in the housing to be changeable in position thereof, the lens unit being configured to concentrate the light generated from the light source;
• a length-variable unit mounted to the housing and connected to the lens unit, the length-variable unit being configured so that a length thereof is changed, in a response to application of electricity thereto, in a direction in which the position of the lens unit is changed;
• and
• a controller configured to control a light radiation direction of the lens unit by setting a voltage of the electricity to be applied to the length-variable unit so that a length of the length-variable unit is changed according to a set voltage and the position of the lens unit is changed according to a change in the length of the length-variable unit.