Head-up display device

A head-up display device that displays information including a video in a part of a field of view of an operator, comprising:

• a video display device that is arranged at a position deviated from the field of view of the operator and configured to generate and project video light for projecting the information;
• and
• a transparent screen that is arranged in a part of the field of view of the operator, and configured to transmit light from the field of view and reflect projection light from the video display device in a direction of the operator,
• wherein a light source of the video display device is a solid-state light source device configured to reflect and mix light emitted from a plurality of light-emitting cells and emits the light obtained by the mixing in a predetermined direction,
• the solid-state light source device includes a light guiding member,
• an outer circumference surface of the light guiding member is covered with a reflection film,
• a leading end portion of the light guiding member is a paraboloidal surface,
• an external shape of the light guiding member is a substantially pyramidal shape that has a rectangular cross section, and
• the plurality of light source cells are arranged on the outer circumference surface.