A vehicle headlight comprising: a light source comprising: a circuit board whose surface is directed toward a front area of the vehicle headlight; a plurality of semiconductor light emitting elements arranged on the surface of the circuit board and configured to emit light; a first reflector configured to reflect the light emitted from the semiconductor light emitting elements toward the front area to form a lower portion of a high beam pattern; and a second reflector configured to reflect the light emitted from the semiconductor light emitting elements toward the front area to form an upper portion of the high beam pattern, wherein the semiconductor light emitting elements are disposed between the first reflector and the second reflector; and a projection lens configured to project the light emitted from the semiconductor light emitting elements toward the front area, characterised in that the plurality of semiconductor light emitting elements is arranged in line on the surface of the circuit board, and the first reflector and the second reflector are disposed on the surface of the circuit board, and further characterised by a changing means configured to change the upper portion of the high beam pattern by controlling an incident state of the light which is incident on the second reflector. a light source comprising: a circuit board whose surface is directed toward a front area of the vehicle headlight; a plurality of semiconductor light emitting elements arranged on the surface of the circuit board and configured to emit light; a first reflector configured to reflect the light emitted from the semiconductor light emitting elements toward the front area to form a lower portion of a high beam pattern; and a second reflector configured to reflect the light emitted from the semiconductor light emitting elements toward the front area to form an upper portion of the high beam pattern, wherein the semiconductor light emitting elements are disposed between the first reflector and the second reflector; and a circuit board whose surface is directed toward a front area of the vehicle headlight; a plurality of semiconductor light emitting elements arranged on the surface of the circuit board and configured to emit light; a first reflector configured to reflect the light emitted from the semiconductor light emitting elements toward the front area to form a lower portion of a high beam pattern; and a second reflector configured to reflect the light emitted from the semiconductor light emitting elements toward the front area to form an upper portion of the high beam pattern, wherein the semiconductor light emitting elements are disposed between the first reflector and the second reflector; and a projection lens configured to project the light emitted from the semiconductor light emitting elements toward the front area, characterised in that the plurality of semiconductor light emitting elements is arranged in line on the surface of the circuit board, and the first reflector and the second reflector are disposed on the surface of the circuit board, and further characterised by a changing means configured to change the upper portion of the high beam pattern by controlling an incident state of the light which is incident on the second reflector.