PROJECTION TYPE IMAGE DISPLAY DEVICE

A step difference exists at a boundary between lens cells in a first direction of a fly-eye lens, whereas a step difference does not exist at a boundary between lens cells in a second direction. Central light transmitted though a central portion of the lens cell in the first direction is incident on a polarized light separation surface of a polarized light conversion element, and the polarized light separation surface reflects a first polarized light included in the central light and transmits a second polarized light. A reflection surface reflects the reflected first polarized light and causes the polarized light conversion element to emit the reflected first polarized light, and a ½ wavelength plate converts the second polarized light transmitted through the polarized light separation surface into the first polarized light and causes the polarized light conversion element to emit the converted first polarized light.