A guide lamp apparatus for a vehicle may include a light source, a side reflector which may be arranged on a lateral side of the light source, form an imaginary light source identical to the light source on a side of the light source, and reflect the light radiated from the light source to be divided into a plurality of lights, and a light collection lens that may be arranged in a front of the light source and collects light from the light source that may be divided into the plurality of lights by the side reflector and forms predetermined patterned images on a road surface.