A low-beam-color-temperature-variable headlight unit comprising: a case ; a condenser lens including a low-beam output surface configured to output a low beam and a light receiving surface located behind the low-beam output surface with respect to a front-back direction of the case ; a high-color-temperature light emitting diode located inside the case , at a position nearer to a center line (C) of the light receiving surface than to a right end and a left end of the light receiving surface with respect to a right-left direction of the case , the high-color-temperature light emitting diode being configured to illuminate a first illuminated area with light passing through the light receiving surface and output from the low-beam output surface , and the high-color-temperature light emitting diode including a high-color-temperature light emitting surface from which high-color-temperature light is emitted; a low-color-temperature light emitting diode located inside the case , side by side with the high-color-temperature light emitting diode in the right-left direction of the case , at a position nearer to the center line (C) of the light receiving surface than to the right end and the left end of the light receiving surface with respect to the right-left direction of the case , the low-color-temperature light emitting diode being configured to illuminate a second illuminated area , which overlaps the first illuminated area at least partly, with light passing through the light receiving surface and output from the low-beam output surface , and the low-color-temperature light emitting diode including a low-color-temperature light emitting surface from which low-color-temperature light is emitted; and a low-beam-color-temperature control unit capable of adjusting the color temperature of the low beam by adjusting the quantity of light emitted from the high-color-temperature light emitting diode and the quantity of light emitted from the low-color-temperature light emitting diode . a case ; a condenser lens including a low-beam output surface configured to output a low beam and a light receiving surface located behind the low-beam output surface with respect to a front-back direction of the case ; a high-color-temperature light emitting diode located inside the case , at a position nearer to a center line (C) of the light receiving surface than to a right end and a left end of the light receiving surface with respect to a right-left direction of the case , the high-color-temperature light emitting diode being configured to illuminate a first illuminated area with light passing through the light receiving surface and output from the low-beam output surface , and the high-color-temperature light emitting diode including a high-color-temperature light emitting surface from which high-color-temperature light is emitted; a low-color-temperature light emitting diode located inside the case , side by side with the high-color-temperature light emitting diode in the right-left direction of the case , at a position nearer to the center line (C) of the light receiving surface than to the right end and the left end of the light receiving surface with respect to the right-left direction of the case , the low-color-temperature light emitting diode being configured to illuminate a second illuminated area , which overlaps the first illuminated area at least partly, with light passing through the light receiving surface and output from the low-beam output surface , and the low-color-temperature light emitting diode including a low-color-temperature light emitting surface from which low-color-temperature light is emitted; and a low-beam-color-temperature control unit capable of adjusting the color temperature of the low beam by adjusting the quantity of light emitted from the high-color-temperature light emitting diode and the quantity of light emitted from the low-color-temperature light emitting diode . <EOS>