A light guide body has a first curved portion curved from a diverging portion toward the one side in a first direction, a second curved portion curved from the diverging portion toward the other side in the first direction, and the diverging portion is formed so that a boundary between at least the first curved portion and the second curved portion draws a straight line in a cross section of a second direction which is perpendicular to an axial direction of a first light guide part.

The present invention relates to an optical component including a light source configured to emit light, a light guide unit configured to receive and guide light emitted by the light source and output the light from the light output surface of the light guide unit, and a backplate configured to provide support for the light guide unit. The light guide unit includes at least a first portion and a second portion, the at least first portion and second portion being arranged at a certain angle to each other. The present invention further provides a lighting device and a motor vehicle.

A light guide body has a first light guide part disposed in front of a light source, a second light guide part extending from a front surface side of the first light guide part toward at least one lateral side of the first light guide part, a plurality of third light guide parts branching and extending from a midway portion of the second light guide part, an incidence part located on a back surface side of the first light guide part, and a first emission part located on a tip side of the plurality of third light guide parts, the second light guide part has a shape in which a cross-sectional area gradually decreases toward the tip side, and the plurality of third light guide parts are arranged next to each other in an extension direction of the second light guide part.