Virtual image display device and optical unit

A virtual image display device of a direct virtual image type, comprising:

• a display element configured to emit image light;
• a first lens on which the image light from the display element is incident;
• a first prism on which the image light passing through the first lens is incident;
• a second prism joined to the first prism and configured to form a prism light guide member having a parallel flat plate shape;
• an oblique mirror portion provided at a joint between the first prism and the second prism and configured to reflect a first part of the image light guided in the first prism;
• a second lens being a plano-convex lens and disposed facing an outer surface of the first prism on which the first part of the image light reflected by the oblique mirror portion is incident;
• a transmission mirror formed at a convex surface of the second lens and configured to reflect a part of the image light reflected by the oblique mirror portion toward the oblique mirror portion;
• a first quarter-wave plate disposed between the outer surface of the first prism and the second lens;
• a compensation lens including a concave surface joined to the convex surface of the second lens via the transmission mirror, and a surface parallel to the outer surface of the first prism;
• a condensing reflection mirror disposed in the second prism and configured to reflect a second part of the image light transmitted through the oblique mirror portion and reflected by an inner surface of the second prism;
• and
• a second quarter-wave plate disposed between the inner surface of the second prism and the condensing reflection mirror.