A projection apparatus is provided with an optical device to diffuse a coherent light beam, an irradiation unit to irradiate a coherent light beam to the optical device, a color generator to perform wavelength conversion of and transmission of light beams in a first illumination zone, in a time division manner, at least one relay optical system to change a travel direction of the wavelength-converted light beam and a travel direction of a light beam to generate an illumination light beam which illuminates a second illumination zone, a spatial light modulator to generate a modulated image to the second illumination zone, and a projection optical system. The first illumination zone and the second illumination zone have a conjugate relationship. The color generator has a transmission portion to transmit the diffused coherent light beam, without diffusing the diffused coherent light beam.