An image projection apparatus comprising: one or more light sources configured to emit light including one or more of three primary colors of light; one or more illumination optical systems configured to illuminate light from the light sources; a first reflection-type light valve group including three light valves (3A, 9A, 14A) corresponding to the three primary colors of light, the first reflection-type light valve group being configured to modulate incident light from the illumination optical systems based on first image information; a second reflection-type light valve group including three light valves (3B, 9B, 14B) corresponding to the three primary colors of light, the second reflection-type light valve group being configured to modulate incident light from the illumination optical systems based on second image information; a first prism-type photosynthesizing member having a function of synthesizing, on one optical axis, light that is reflected by the first reflection-type light valve group, the light having been separated into the three primary colors; a second prism-type photosynthesizing member having a function of synthesizing, on one optical axis, light that is reflected by the second reflection-type light valve group, the light having been separated into the three primary colors; and a prism-type beam splitter configured to synthesize, on one optical axis, light that has been reflected by the first reflection-type light valve group and modulated based on the first image information and light that has been reflected by the second reflection-type light valve group and modulated based on the second image information, wherein the first prism-type photosynthesizing member and the second prism-type photosynthesizing member include three polarizing beam splitters (2A, 8A, and 13A; 2B, 8B, and 13B) corresponding to the three primary colors. one or more light sources configured to emit light including one or more of three primary colors of light; one or more illumination optical systems configured to illuminate light from the light sources; a first reflection-type light valve group including three light valves (3A, 9A, 14A) corresponding to the three primary colors of light, the first reflection-type light valve group being configured to modulate incident light from the illumination optical systems based on first image information; a second reflection-type light valve group including three light valves (3B, 9B, 14B) corresponding to the three primary colors of light, the second reflection-type light valve group being configured to modulate incident light from the illumination optical systems based on second image information; a first prism-type photosynthesizing member having a function of synthesizing, on one optical axis, light that is reflected by the first reflection-type light valve group, the light having been separated into the three primary colors; a second prism-type photosynthesizing member having a function of synthesizing, on one optical axis, light that is reflected by the second reflection-type light valve group, the light having been separated into the three primary colors; and a prism-type beam splitter configured to synthesize, on one optical axis, light that has been reflected by the first reflection-type light valve group and modulated based on the first image information and light that has been reflected by the second reflection-type light valve group and modulated based on the second image information, wherein the first prism-type photosynthesizing member and the second prism-type photosynthesizing member include three polarizing beam splitters (2A, 8A, and 13A; 2B, 8B, and 13B) corresponding to the three primary colors.