Embodiments of the present invention relate to light which implements a high optical efficiency using a small amount of light source while having a free curvature with no restrictions on the shape of installation places, and more particularly, the purpose of the embodiments of the present invention is to provide a vehicular lamp for controlling indirect light emission by introducing light into a partial area, in which a dark portion occurs, in the case of a lighting device having a light emission surface curved or bent, thereby improving the optical efficiency.