| 摘要 |
A head up display device includes a display, an optical system having a reflecting mirror, a motor, and a reduction gear mechanism having gears in engagement with each other. A stopper gear is further on a preceding side than the last gear in the mechanism. The stopper gear includes a partial gear portion having teeth arranged in a region of the stopper gear in a range of less than 360 degrees in its rotational direction. Rotation of the stopper gear is stopped by engagement of both-end teeth of the partial gear portion with a stopper-adjacent gear, so a range of a rotation angle of the mirror is limited to a predetermined adjustable range, which includes a displayable range. The angle between an adjustable range lower limit and displayable range lower limit, and the angle between an adjustable range upper limit and displayable range upper limit are larger than 0 degrees.
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