Virtual image display device including incident side and emission side diffraction elements

A virtual image display device comprising:

• a first display light guiding unit including a first surface and a second surface opposite to the first surface;
• an image forming unit emitting a first image light and a second image light into the first display light guiding unit from the first surface;
• a first incident side diffraction element that is disposed at the first surface side of the first display light guiding unit and diffracts the first image light as a third image light;
• a second incident side diffraction element that is disposed at the second surface side of the first display light guiding unit and diffracts the second image light as a fourth image light;
• a first emission side diffraction element that is disposed at the first surface side and diffracts the third image light as a fifth image light;
• a second emission side diffraction element that is disposed at the second surface side and diffracts the fourth image light as a sixth image light.