A vehicle headlamp lighting unit (1, 1B, 1C, 1D) having an optical axis (Ax) and comprising: a solid light guide having a light exiting surface, a reflection surface opposite to the light exiting surface, and a light incident surface through which light enters the light guide so that the light reaches and is internally reflected off the light exiting surface, then internally reflected off the reflection surface, and exits through the light exiting surface as light parallel to the optical axis (Ax); and an LED light source disposed to face to the light incident surface, for emitting light that enters the light guide through the light incident surface, is internally reflected off the light exiting surface, is internally reflected off the reflection surface, and exits through the light exiting surface as light parallel to the optical axis (Ax), characterized in that the reflection surface includes a plurality of divided reflection regions (a1, a2, a3, b1, b2, b3, c1, c2, c3) divided by at least one horizontal plane and at least one vertical plane, the reflection regions (a1 to a3, b1 to b3, c1 to c3) arranged in vertical direction include at least one reflection region disposed at a reference position and at least one reflection region disposed at a position closer to the light exiting surface than the reference position, and the reflection regions (a1 to a3, b1 to b3, c1 to c3) arranged in vertical direction are each disposed at a position shifted closer to the light exiting surface as the reflection region (a1 to a3, b1 to b3, c1 to c3) is closer to the light incident surface with respect to the at least one reflection region disposed at the reference position so that the light internally reflected off the light exiting surface is prevented from entering a step (d1, d2) appearing between the adjacent reflection regions (a1 to a3, b1 to b3, c1 to c3) and the reflection regions (a1 to c1, a2 to c2, a3 to c3) arranged in horizontal direction are each disposed at a position shifted closer to the light exiting surface so that the light internally reflected off the light exiting surface is prevented from entering a step (d3, d4) appearing between adjacent reflection regions (a1 to c1, a2 to c2, a3 to c3). a solid light guide having a light exiting surface, a reflection surface opposite to the light exiting surface, and a light incident surface through which light enters the light guide so that the light reaches and is internally reflected off the light exiting surface, then internally reflected off the reflection surface, and exits through the light exiting surface as light parallel to the optical axis (Ax); and an LED light source disposed to face to the light incident surface, for emitting light that enters the light guide through the light incident surface, is internally reflected off the light exiting surface, is internally reflected off the reflection surface, and exits through the light exiting surface as light parallel to the optical axis (Ax), characterized in that the reflection surface includes a plurality of divided reflection regions (a1, a2, a3, b1, b2, b3, c1, c2, c3) divided by at least one horizontal plane and at least one vertical plane, the reflection regions (a1 to a3, b1 to b3, c1 to c3) arranged in vertical direction include at least one reflection region disposed at a reference position and at least one reflection region disposed at a position closer to the light exiting surface than the reference position, and the reflection regions (a1 to a3, b1 to b3, c1 to c3) arranged in vertical direction are each disposed at a position shifted closer to the light exiting surface as the reflection region (a1 to a3, b1 to b3, c1 to c3) is closer to the light incident surface with respect to the at least one reflection region disposed at the reference position so that the light internally reflected off the light exiting surface is prevented from entering a step (d1, d2) appearing between the adjacent reflection regions (a1 to a3, b1 to b3, c1 to c3) and the reflection regions (a1 to c1, a2 to c2, a3 to c3) arranged in horizontal direction are each disposed at a position shifted closer to the light exiting surface so that the light internally reflected off the light exiting surface is prevented from entering a step (d3, d4) appearing between adjacent reflection regions (a1 to c1, a2 to c2, a3 to c3).