Head-up display apparatus in which reflecting mirror is rotated

A head-up display apparatus comprising:

• a reflecting mirror rotatable around a first rotation axis extending in a transversal direction;
• a first gear disposed in a lower edge portion of the reflecting mirror;
• and
• a rotating apparatus including a second gear that meshes with the first gear from below and that is rotatable around a second rotation axis aligned with the first rotation axis, wherein
• the reflecting mirror includes:
• a left shaft part and a right shaft part extending along the first rotation axis;
• and
• a main body made of resin disposed between the left shaft part and the right shaft part in the transversal direction,
• the main body includes:
• a front surface having a mirror surface and an offset surface;
• a rib extending from a front lower edge portion of the front surface of the main body toward a rear side of the reflecting mirror;
• and
• a coupling part that protrudes downward from the rib such that the first gear is adapted to be fitted into the coupling part, wherein
• the offset surface extends downward from a part of the front lower edge portion of the front surface of the main body and above the coupling part, and
• a depth of the rib in a first section in contact with the offset surface is larger than a depth of the rib in a second section not in contact with the offset surface, and
• when the rotating apparatus rotates the second gear, the reflecting mirror is rotated.