1. A projection type display apparatus comprising:an illumination unit that emits a plurality of color lights having a predetermined polarization direction;
a plurality of optical path adjustment units that totally reflect the plurality of color lights, respectively;
a plurality of optical modulation units that modulates the plurality of color lights totally reflected by the plurality of optical path adjustment units, respectively, to emit a plurality of modulated color lights;
a synthesis unit that emits the plurality of modulated color lights emitted from the optical modulation units in a same direction; and
a correction unit that is arranged on an optical path between the illumination unit and the synthesis unit and that changes a polarization state of light that entered the correction unit to convert light that is incident on the synthesis unit into linearly polarized light,
wherein the correction unit also is provided on each optical path between the plurality of optical path adjustment units and the synthesis unit.