1. A projection display device which outputs, from a projection unit, light that carries information including an arbitrary planar display image displayed in a prescribed display region and guides the light to a windshield of a vehicle or its vicinity so that the display image carried by the light reflected from a surface of the windshield or its vicinity is projected and visually recognized as a virtual image from a prescribed eye point, wherein a first image forming plane and a second image forming plane are provided as image forming planes of the virtual image, the first image forming plane is disposed approximately parallel with a plane that is perpendicular to a line of sight that connects the eye point and the virtual image, and the second image forming plane is inclined with respect to the plane that is perpendicular to the line of sight that connects the eye point and the virtual image.