Vehicle display device

In a vehicle display device, in accordance with a change in a degree of lightness around a vehicle based on illuminance detected by an illuminance sensor that detects illuminance around the vehicle, a brightness adjustment unit makes a response of brightness adjustment of a virtual image to the detected change in illuminance relatively fast when an age of a driver estimated by an age estimation unit is relatively high, and makes a response of the brightness adjustment of the virtual image to the detected change in illuminance relatively slow when the age of the driver is relatively low.