To provide a projection type video display device performing as optimum cooling control as possible even when clogging is caused in a filter.

Air pressure data outputted by an air pressure sensor 47 and air quantity data outputted by an air quantity sensor 49 are inputted in a system control circuit 40. The system control circuit 40 is equipped with a table storing part 40a. A control table is stored in the table storing part 40a. The control table regulates an added voltage value to a fan power source set according to an air pressure value and an air quantity value. The added voltage value means voltage added to an ordinary set voltage value, and is set, for example, in the range of 0 to 6V. The ordinary set voltage value is voltage set on the basis of the temperature detected, for example, by the temperature sensor. In such a case, the added voltage value is added to the voltage to the fan power source determined according to the outside air temperature.