HEADLAMP OPTICAL ELEMENT, HEADLAMP MODULE, VEHICLE LAMP, AND VEHICLE

The invention relates to a vehicle lighting device, and discloses a headlamp optical element which includes light collecting parts (11), a light emitting part (12) and a reflecting part (13) which are connected in sequence, wherein the reflecting part is connected with a lower portion or an upper portion of the light emitting part and is provided with a low beam cutoff line structure (15) or a high beam cutoff line structure (17); the light collecting parts are in light concentrating cup structures, the endof the light collecting part away from the reflecting part is provided with concave cavity, the concave cavity includes a cambered front light incident surface (111) and a lateral light incident surface (112), the lateral light incident surface is curved surface with smaller circumference as being closer to the reflecting part, and outer contour surface of the light collecting part is curved surface with larger circumference as being closer to the reflecting part; and a lower portion of the light collecting part is provided with a region III light shape forming structure (14), part of light converged by the light collecting part can be emitted from the region III light shape forming structure and emitted under the reflecting part in sequence to form a light shape of a low beam region III (53). The headlamp optical element is simple and compact in structure and lighter in weight. In addition, the invention further discloses a headlamp module, a vehicle lamp and a vehicle.