Polarized light illuminator and projecting type image display

Integrator optical system polarization direction from the light source passes through the random been comprising a second lens plate (110) is designed shaped aperture (102) enters the polarization separation section (103). Polarization separation section (103), separates the incident light beam 2 is polarized perpendicular to the polarization direction. Then, the polarization conversion unit (104) so ​​that the same two beams of light changes the polarization direction. According to the above embodiment can be obtained capable of randomly polarized light into arbitrary polarization direction of the polarized light illumination apparatus can be suppressed and the illumination light diffused. This polarized light illumination apparatus suitable for use as an illumination apparatus using a projection-type image modulating polarized light and the light valve liquid crystal display device, and enables low cost and high brightness while achieving the device.