Vehicle display device

A vehicle display device comprising:

• an image display unit that emits display light for an image;
• an optical system that projects the display light emitted from the image display unit toward a reflecting surface in front of a driver;
• and
• a control unit that controls the image display unit, wherein
• the image includes a both-eye region that is a region visually recognized by both eyes of the driver and a one-eye region that is a region visually recognized by only one eye of the driver,
• the control unit sets a non-display region at a boundary portion between the both-eye region and the one-eye region and controls such that at least no static image is displayed in the non-display region,
• the control unit sets a width of the non-display area based on an average amplitude of movement of a head of the driver in a left-right direction, and
• the control unit changes the width of the non-display area in proportion to a change in the average amplitude.