Provided is a lighting device capable of implementing optical images having desired shapes through a pattern design, the lighting device including: a light source portion having light sources; a light guide portion having a larger thickness than a height of a light emitting surface of the respective light sources and irradiating an incident beam from a side; a three-dimensional forming portion provided inside the light guide portion, on a first surface or on a second surface; and a reflective portion on the light guide portion or the three-dimensional effect forming portion, wherein the three-dimensional effect forming portion includes multiple patterns sequentially arranged and having respective inclined surfaces with inclination angles with respect to the first surface, wherein the multiple patterns guide light passing along the light guide portion into a first surface direction or a second surface direction, thereby implementing line shaped beams of a first path.