Polarization beam splitter and image projection apparatus using the same

An image projection apparatus comprising:

• a light source portion capable of emitting light containing a first color light beam, a second color light beam, and a third color light beam which have wavelengths different from each other;
• a polarization beam splitter comprising:
• a first prism;
• a second prism;
• a polarization beam split portion in contact with the second prism;
• a substrate provided between the polarization beam split portion and the first prism;
• a first adhesive portion provided between the first prism and the substrate;
• and
• a second adhesive portion provided between the polarization beam split portion and the substrate;
• a refractive optical modulation portion:
• and
• a retaining portion capable of retaining a projection optical system that guides light from the refractive optical modulation portion to a projection surface, wherein
• the polarization beam splitter is arranged such that light from the light source portion passes through the polarization beam splitter and is incident on the refractive optical modulation portion, and light modulated by the refractive optical modulation portion is reflected by the polarization beam splitter.