Head-up display device

A head-up display device, comprising:

• a projector that projects light;
• a mirror that reflects the light projected by the projector;
• a combiner on which the reflected light is projected;
• a housing accommodating the projector and the mirror, the housing provided with an opening through which the reflected light passes to be projected on the combiner;
• a cover including:
• a first cover part;
• and
• a second cover part, the first cover part and the second cover part covering the opening;
• and
• a biasing member that biases the second cover part toward an outside of the housing when the first cover part and the second cover part cover the opening,
• wherein the first cover part includes:
• a first rotation fulcrum fixed to the housing, the first cover part being turnable about the first rotation fulcrum with respect to the housing;
• a first end part;
• and
• a second end part, the first end part and the second end part each being disposed on an end of the first cover part farthest from the first rotation fulcrum;
• the second cover part includes:
• a second rotation fulcrum fixed to the first end part and the second end part, the second cover part being turnable about the second rotation fulcrum with respect to the first cover part wherein:
• the biasing member is connected to a coupler that couples the second cover part to the first cover part, and
• the biasing member biases the second cover part toward an outside of the housing such that contact is maintained between an upper surface of an engagement part of the second cover part and a lower surface of a third end part of the first cover part, when the first cover part and the second cover part cover the opening.