Display device and head-mounted display

The invention provides a display device which can be thinned and can improve display characteristics, and a head-mounted display provided with the display device. The display device is provided with: a display panel, a linear polarizing plate, and a first polarization selection reflecting plate, which are arranged in this order toward an observer side; a first phase difference plate and a first lens which are provided on the observer side of the first polarization selection reflection plate and are disposed facing each other; a half mirror provided on the observer side of the first retardation plate and the first lens; a second lens and a second phase difference plate which are provided on the observer side of the half mirror and are disposed facing each other; and a second polarization selection reflection plate provided on the observer side of the second lens and the second phase difference plate, the first lens and the second lens having an asymmetric shape with the half mirror as a plane of symmetry in a