Lighting unit and head-up display device

A head-up display device configured to project a display image formed by a display unit onto a projection member to visually display a virtual image of the display image in a visual recognition region, the head-up display device comprising:

• a lighting unit configured to transmissively light the display unit to illuminate the display image, wherein
• the lighting unit includes:
• a light source configured to radiate the light to transmissively light the display unit;
• a circuit board on which the light source is mounted;
• and
• a plurality of stages of condenser lenses configured to condense the light radiated from the light source, wherein
• a first-stage lens among the plurality of stages of condenser lenses is located closest to the light source and has a maximum positive power, and
• the first-stage lens includes:
• a partition wall portion partitioning an accommodation space, in which the light source is accommodated in a range from a composite focal point of the plurality of stages of condenser lenses to the first-stage lens, by a protrusion toward the circuit board;
• and
• a positioning portion provided on the partition wall portion and positioned relative to the circuit board by concavo-convex fitting.