Projector and method of preventing image deterioration thereof

A projector comprising:

• a light source;
• an image forming panel that modulates light, which is emitted from the light source, on the basis of image information so as to form image light;
• a projection lens that has a lens and a lens barrel holding the lens and projects image light which is formed by the image forming panel, where a center of the image forming panel is disposed to be shifted with respect to an optical axis of the projection lens;
• a cooling duct through which air for cooling a first part of the lens barrel on a side, to which the image forming panel is shifted with respect to the optical axis of the projection lens, passes;
• a heating duct through which air for heating a second part of the lens barrel on a side, which is opposite to the side to which the image forming panel is shifted with respect to the optical axis of the projection lens, passes;
• a connecting duct that connects the cooling duct and the heating duct, causes air from the cooling duct to pass through the light source, and sends the air to the heating duct;
• and
• a blower that is mounted on any one of the cooling duct, the connecting duct, and the heating duct and sends at least a part of air suctioned from an inlet of the cooling duct to an outlet of the heating duct.