The image projection apparatus includes a wavelength conversion element, an illumination optical system including a reflective-transmissive surface reflecting a first light and transmitting a second light, guiding the reflected first light to the wavelength conversion element, and allowing the illumination light to exit therefrom while making part of the illumination light incident on the reflective-transmissive surface. The illumination optical system or a projection optical system includes a light limiter changing a sectional area of the illumination light used for producing an image light projected to the projection surface. The reflective-transmissive surface is provided such that an incident area of the illumination light on the reflective-transmissive surface decreases with a decrease in the sectional area of the illumination light, and that the incident area of the illumination light increases with an increase in the sectional area of the illumination light.