A vehicle lighting device for use with a vehicle, the vehicle lighting device comprising: a first light source and a second light source; and a light guide lens that is elongate and extends along a direction oblique to a front-back direction of the vehicle, when the lighting device is installed on the vehicle, wherein the first light source is arranged to face a back end portion of the light guide lens in a longitudinal direction of the light guide lens, the second light source is arranged close to a front end portion of the light guide lens in the longitudinal direction and backward of an extended line of a straight line connecting the front end portion and the back end portion, such that light emitted from the second light source is illuminated onto substantially the entire length of a back surface of the light guide lens, the light guide lens has a plurality of lens cut portions in the back surface thereof, the lens cut portions being arranged parallel with each other in the longitudinal direction, the plurality of lens cut portions are formed to internally reflect the light, which is emitted from the first light source and enters into the light guide lens through the back end portion, to a forward direction of the vehicle, and are formed to refract the light, which is emitted from the second light source and enters into the light guide lens to be internally reflected to the forward direction of the vehicle, when the lighting device is installed on the vehicle, the lens cut portions are formed in the shape of saw teeth that are arranged in parallel with the longitudinal direction of the light guide lens, and have first and second prism faces (241, 242) arranged in foreside and backside of the longitudinal direction, respectively, an upstroke portion of the first prism face is formed to internally reflect the light, which is emitted from the first light source and enters into the light guide lens through the back end portion, to the forward direction of the vehicle, when the lighting device is installed on the vehicle, a tip portion of the first prism face is formed to allow the light emitted from the second light source to enter into the light guide lens, and the second prism face is formed to internally reflect the light, which enters into the light guide lens from the tip portion of the first prism face, to the forward direction of the vehicle, when the lighting device is installed on the vehicle. a first light source and a second light source; and a light guide lens that is elongate and extends along a direction oblique to a front-back direction of the vehicle, when the lighting device is installed on the vehicle, wherein the first light source is arranged to face a back end portion of the light guide lens in a longitudinal direction of the light guide lens, the second light source is arranged close to a front end portion of the light guide lens in the longitudinal direction and backward of an extended line of a straight line connecting the front end portion and the back end portion, such that light emitted from the second light source is illuminated onto substantially the entire length of a back surface of the light guide lens, the light guide lens has a plurality of lens cut portions in the back surface thereof, the lens cut portions being arranged parallel with each other in the longitudinal direction, the plurality of lens cut portions are formed to internally reflect the light, which is emitted from the first light source and enters into the light guide lens through the back end portion, to a forward direction of the vehicle, and are formed to refract the light, which is emitted from the second light source and enters into the light guide lens to be internally reflected to the forward direction of the vehicle, when the lighting device is installed on the vehicle, the lens cut portions are formed in the shape of saw teeth that are arranged in parallel with the longitudinal direction of the light guide lens, and have first and second prism faces (241, 242) arranged in foreside and backside of the longitudinal direction, respectively, an upstroke portion of the first prism face is formed to internally reflect the light, which is emitted from the first light source and enters into the light guide lens through the back end portion, to the forward direction of the vehicle, when the lighting device is installed on the vehicle, a tip portion of the first prism face is formed to allow the light emitted from the second light source to enter into the light guide lens, and the second prism face is formed to internally reflect the light, which enters into the light guide lens from the tip portion of the first prism face, to the forward direction of the vehicle, when the lighting device is installed on the vehicle.