An image projection apparatus that illuminates an image forming element arranged downstream of the image forming element and configured to form an original image by using light form a light source, and projects light from the image forming element onto a projected screen includes a housing having an inlet port with a dust removal filter, a fan configured to draw air into the housing through the inlet port, a duct configured to lead the air drawn from the inlet port into a space that contains the image forming element, and a chamber provided between the inlet port and the duct, wherein a sectional area of the chamber is larger in a direction orthogonal to an inflow direction of air into the duct at a connection part between the chamber and the duct than a sectional area of the connection part.