A lighting device to be mounted on a vehicle has a light source, a projection lens having an optical axis, and disposed so as to allow at least some of light emitted from the light source to pass therethrough, a holder that holds the projection lens, a pivot shaft provided at one of the projection lens and the holder and extending in a direction intersecting with the optical axis of the projection lens, a bearing provided at the other of the projection lens and the holder and that holds the pivot shaft, and an aiming mechanism configured to pivot the projection lens relative to the holder about the pivot shaft.