To provide a head-up display device for a vehicle, reducing distortion of a contour line in a display image.

The head-up display device for the vehicle is equipped with: a display element 23 emitting display light L; a case body 24 having an aperture 24a through which the display light L passes and a base part 24b which surrounds the aperture 24a; and a reflection member 31 reflecting the display light L passing through the aperture 24a, wherein a projection member 13 having predetermined curvature is irradiated with the display light L reflected by the reflection member 31, thereby making a user 14 of the vehicle view the display image V obtained by such irradiation. An upper aperture edge part R1 and a lower aperture edge part R2 in a boundary portion between the aperture 24a and the base part 24b are formed into curved shape.