A vehicle lighting unit which emits light parallel to an optical axis (Ax) in a front direction, the vehicle lighting unit comprising: a light source which emits light obliquely to the optical axis (Ax) in the front direction, wherein the light source is composed of a light emitting diode and wherein an exit surface of the light source faces obliquely in the front direction in such a way that an angle ( θ 1) between a central axis in a light emitting direction of the light source and the optical axis (Ax) is 45±10°; and a light guiding body which guides the light emitted from the light source so as to emit the light, the light guiding body including: an incidence surface disposed to face the light source with a gap in between, wherein the light emitted from the light source enters the light guiding body through the incidence surface; a front surface having an exit surface and a first reflection surface; and a back surface having a second reflection surface, wherein: the first reflection surface and the exit surface are connected smoothly with each other while overlapping with each other, and are curved in an up/down direction and in a right/left direction so as to be convex in the front direction, the light which enters the light guiding body through the incidence surface is internally reflected by the first reflection surface in a back direction, and the light which is internally reflected by the first reflection surface is internally reflected by the second reflection surface in the front direction to the exit surface so that the light is emitted from the light guiding body through the exit surface while the light is made to be parallel to the optical axis (Ax) in the front direction. a light source which emits light obliquely to the optical axis (Ax) in the front direction, wherein the light source is composed of a light emitting diode and wherein an exit surface of the light source faces obliquely in the front direction in such a way that an angle ( θ 1) between a central axis in a light emitting direction of the light source and the optical axis (Ax) is 45±10°; and a light guiding body which guides the light emitted from the light source so as to emit the light, the light guiding body including: an incidence surface disposed to face the light source with a gap in between, wherein the light emitted from the light source enters the light guiding body through the incidence surface; a front surface having an exit surface and a first reflection surface; and a back surface having a second reflection surface, wherein: the first reflection surface and the exit surface are connected smoothly with each other while overlapping with each other, and are curved in an up/down direction and in a right/left direction so as to be convex in the front direction, the light which enters the light guiding body through the incidence surface is internally reflected by the first reflection surface in a back direction, and the light which is internally reflected by the first reflection surface is internally reflected by the second reflection surface in the front direction to the exit surface so that the light is emitted from the light guiding body through the exit surface while the light is made to be parallel to the optical axis (Ax) in the front direction. an incidence surface disposed to face the light source with a gap in between, wherein the light emitted from the light source enters the light guiding body through the incidence surface; a front surface having an exit surface and a first reflection surface; and a back surface having a second reflection surface, wherein: the first reflection surface and the exit surface are connected smoothly with each other while overlapping with each other, and are curved in an up/down direction and in a right/left direction so as to be convex in the front direction, the light which enters the light guiding body through the incidence surface is internally reflected by the first reflection surface in a back direction, and the light which is internally reflected by the first reflection surface is internally reflected by the second reflection surface in the front direction to the exit surface so that the light is emitted from the light guiding body through the exit surface while the light is made to be parallel to the optical axis (Ax) in the front direction. the first reflection surface and the exit surface are connected smoothly with each other while overlapping with each other, and are curved in an up/down direction and in a right/left direction so as to be convex in the front direction, the light which enters the light guiding body through the incidence surface is internally reflected by the first reflection surface in a back direction, and the light which is internally reflected by the first reflection surface is internally reflected by the second reflection surface in the front direction to the exit surface so that the light is emitted from the light guiding body through the exit surface while the light is made to be parallel to the optical axis (Ax) in the front direction.