A virtual image display device includes a projection optical system that includes a projection mirror that projects an image display light toward a virtual image presentation plate. The projection mirror has a concavely curved surface and is arranged such that a curvature in a second cross section intersecting the concavely curved surface is larger than a curvature in a first cross section intersecting the concavely curved surface. The second cross section is orthogonal to the first cross section. The display unit is provided at a focal point of a composite optical system within a meridional plane, the composite optical system being formed by the virtual image presentation plate and the projection optical system.