Disclosed are a vehicle lamp optical element, a vehicle lamp module including the vehicle lamp optical element, a vehicle headlamp, and a vehicle. The vehicle lamp optical element includes a light input unit 1, a transmission unit 2, and a light output unit 3 that are sequentially installed, and at least one light incident structure 11 is installed in the light input unit 1, and transmission In the unit (2), the rear end and the leading end along the light exit direction are the light input end 21 and the light exit end 22 of the transmission unit, respectively, and the end of the light exit unit 3 facing the light exit end 22 of the transmission unit is the light exit surface. 31 , wherein the light exit surface 31 is a curved surface protruding forward; The distance between at least one set of opposite sides of the transmitter 2 is gradually increased from one end close to the light incident end 21 of the transmitter to one end close to the light exit end 22 of the transmitter. The vehicle lamp optical device has a small volume, high optical precision, accurate light pattern, and convenient installation.
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