A vehicle lighting device, comprising: a long light guide lens disposed extending in a direction obliquely tilted with respect to a front-rear direction of the vehicle; a light source (2, 21) disposed opposite an end at a front side in a longitudinal direction of the light guide lens; another light source (2, 22) that is disposed opposite an end at a rear side in the longitudinal direction of the light guide lens, and a reflector disposed behind the light guide lens along the longitudinal direction, wherein the light guide lens comprises a front face substantially parallel to the longitudinal direction and a rear face with lens cuts aligned in the longitudinal direction, wherein each of the lens cuts comprises a first prism face that stands backward at a steep angle (α1) with respect to the longitudinal direction, a second prism face that is formed in a flat shape substantially parallel to the front face and continues to a rear end of the first prism face, and a third prism face that continues to a front end of the second prism face and which stands backward at a relatively moderate angle (α2) with respect to the longitudinal direction of the light guide lens; wherein a front face of the reflector has reflecting protrusions that are aligned in the longitudinal direction of the light guide lens at intervals corresponding to grooves between the lens cuts in the rear face of the light guide lens, wherein light that has exited backward from the light guide lens through the first prism face of a particular lens cut is reflected forward on the reflector toward the second prism face of a different lens cut that is located rearward of the particular lens cut, and wherein light that has entered the light guide lens from the other light source (2,22) and has been guided toward the front side is internally reflected forward on the third prism face. a long light guide lens disposed extending in a direction obliquely tilted with respect to a front-rear direction of the vehicle; a light source (2, 21) disposed opposite an end at a front side in a longitudinal direction of the light guide lens; another light source (2, 22) that is disposed opposite an end at a rear side in the longitudinal direction of the light guide lens, and a reflector disposed behind the light guide lens along the longitudinal direction, wherein the light guide lens comprises a front face substantially parallel to the longitudinal direction and a rear face with lens cuts aligned in the longitudinal direction, wherein each of the lens cuts comprises a first prism face that stands backward at a steep angle (α1) with respect to the longitudinal direction, a second prism face that is formed in a flat shape substantially parallel to the front face and continues to a rear end of the first prism face, and a third prism face that continues to a front end of the second prism face and which stands backward at a relatively moderate angle (α2) with respect to the longitudinal direction of the light guide lens; wherein a front face of the reflector has reflecting protrusions that are aligned in the longitudinal direction of the light guide lens at intervals corresponding to grooves between the lens cuts in the rear face of the light guide lens, wherein light that has exited backward from the light guide lens through the first prism face of a particular lens cut is reflected forward on the reflector toward the second prism face of a different lens cut that is located rearward of the particular lens cut, and wherein light that has entered the light guide lens from the other light source (2,22) and has been guided toward the front side is internally reflected forward on the third prism face.