A vehicular light comprising: a plurality of LED light sources (2, 2a to 2g); and a light guide body configured to take in and guide light rays from each of the plurality of LED light sources (2, 2a to 2g) and cause the guided light rays to exit therefrom, wherein the light guide body has: a light incident portion configured to receive light rays from each of the plurality of LED light sources (2, 2a to 2g) so that entered light rays are substantially parallel light rays, a light guide portion configured to guide the respective substantially parallel light rays taken from the light incident portion in the same direction, a light reflection portion configured to internally reflect the light rays guided by the light guide portion toward a light exit portion having a light exit surface, and the light exit portion configured to allow the light rays reflected by the light reflection portion to exit toward the outside, wherein the light guide portion is provided with at least one slit extending along a light guiding direction of the substantially parallel light rays, wherein the slit is formed to penetrate the light guide portion in a thickness direction thereof and linearly extend along the light exit surface between a position corresponding to an LED light source located closest to the light exit surface of the light guide portion and a position corresponding to an LED light source adjacent thereto among the plurality of the LED light sources (2, 2a to 2g), while the slit is formed within a predetermined length range from the LED light source side so as to have a certain length not reaching the light reflecting portion, and wherein the slit has a tapered width region formed in a range of a predetermined length from the LED light source side and gradually narrowing in width, and a distal end surface with a curved surface shape forming a distal end portion of the tapered width region.. a plurality of LED light sources (2, 2a to 2g); and a light guide body configured to take in and guide light rays from each of the plurality of LED light sources (2, 2a to 2g) and cause the guided light rays to exit therefrom, wherein the light guide body has: a light incident portion configured to receive light rays from each of the plurality of LED light sources (2, 2a to 2g) so that entered light rays are substantially parallel light rays, a light guide portion configured to guide the respective substantially parallel light rays taken from the light incident portion in the same direction, a light reflection portion configured to internally reflect the light rays guided by the light guide portion toward a light exit portion having a light exit surface, and the light exit portion configured to allow the light rays reflected by the light reflection portion to exit toward the outside, a light incident portion configured to receive light rays from each of the plurality of LED light sources (2, 2a to 2g) so that entered light rays are substantially parallel light rays, a light guide portion configured to guide the respective substantially parallel light rays taken from the light incident portion in the same direction, a light reflection portion configured to internally reflect the light rays guided by the light guide portion toward a light exit portion having a light exit surface, and the light exit portion configured to allow the light rays reflected by the light reflection portion to exit toward the outside, wherein the light guide portion is provided with at least one slit extending along a light guiding direction of the substantially parallel light rays, wherein the slit is formed to penetrate the light guide portion in a thickness direction thereof and linearly extend along the light exit surface between a position corresponding to an LED light source located closest to the light exit surface of the light guide portion and a position corresponding to an LED light source adjacent thereto among the plurality of the LED light sources (2, 2a to 2g), while the slit is formed within a predetermined length range from the LED light source side so as to have a certain length not reaching the light reflecting portion, and wherein the slit has a tapered width region formed in a range of a predetermined length from the LED light source side and gradually narrowing in width, and a distal end surface with a curved surface shape forming a distal end portion of the tapered width region..