A projector comprising: first, second and third light modulation devices (351B, 351G, 351R) configured to modulate first, second and third color lights, respectively; a color combining device that has a plurality of light entrance surfaces (354B, G, R) that receive respective first, second and third color lights modulated by the first, second and third light modulation devices, and combines the respective first, second and third color lights; and a cooling device configured to cool the first, second and third light modulation devices, wherein the cooling device includes a cooling fan configured to introduce and discharge air, and a duct configured to guide air received from the cooling fan toward the first, second and third light modulation devices, and the duct includes a first duct portion containing the first and second light modulation devices (351B, 351G) in adjacently disposed order and the color combining device, the first duct portion being configured to allow air from the cooling fan to flow through the first light modulation device, and to flow through the second light modulation device, the first duct portion being configured to allow air from the cooling fan to cool the first light modulation device, and to allow the air cooling the first light modulation device to cool the second light modulation device, wherein a second duct portion which communicates with the first duct portion by means of a communication port formed on the second duct portion and which guides a part of the air flowing through the first duct portion and through the communication port toward the third light modulation device external to the first duct portion, wherein the other part of the air flowing through the first duct portion serves to cool the first and second light modulation devices (351B, 351G). first, second and third light modulation devices (351B, 351G, 351R) configured to modulate first, second and third color lights, respectively; a color combining device that has a plurality of light entrance surfaces (354B, G, R) that receive respective first, second and third color lights modulated by the first, second and third light modulation devices, and combines the respective first, second and third color lights; and a cooling device configured to cool the first, second and third light modulation devices, wherein the cooling device includes a cooling fan configured to introduce and discharge air, and a duct configured to guide air received from the cooling fan toward the first, second and third light modulation devices, and a cooling fan configured to introduce and discharge air, and a duct configured to guide air received from the cooling fan toward the first, second and third light modulation devices, and the duct includes a first duct portion containing the first and second light modulation devices (351B, 351G) in adjacently disposed order and the color combining device, the first duct portion being configured to allow air from the cooling fan to flow through the first light modulation device, and to flow through the second light modulation device, the first duct portion being configured to allow air from the cooling fan to cool the first light modulation device, and to allow the air cooling the first light modulation device to cool the second light modulation device, wherein a second duct portion which communicates with the first duct portion by means of a communication port formed on the second duct portion and which guides a part of the air flowing through the first duct portion and through the communication port toward the third light modulation device external to the first duct portion, wherein the other part of the air flowing through the first duct portion serves to cool the first and second light modulation devices (351B, 351G). a first duct portion containing the first and second light modulation devices (351B, 351G) in adjacently disposed order and the color combining device, the first duct portion being configured to allow air from the cooling fan to flow through the first light modulation device, and to flow through the second light modulation device, the first duct portion being configured to allow air from the cooling fan to cool the first light modulation device, and to allow the air cooling the first light modulation device to cool the second light modulation device, wherein a second duct portion which communicates with the first duct portion by means of a communication port formed on the second duct portion and which guides a part of the air flowing through the first duct portion and through the communication port toward the third light modulation device external to the first duct portion, wherein the other part of the air flowing through the first duct portion serves to cool the first and second light modulation devices (351B, 351G).