PURPOSE: To aim at reducing a rate of energy consumption, by constituting a device so as to cut off a continuous rating current to be fed to a blower motor when it is during fresh-air intake operation and a car speed is more than the specified value, in case of a blast controller for a ram pressure recovery air conditioner.

CONSTITUTION: A microswitch 14 is turned to OFF in time of an intake of fresh air and to ON at the inside air, respectively. A relay 17 comes to ON at a car speed being less than a fixed speed and OFF at more than the fixed speed. Therefore, in time of being less in air conditioning load, if a switch 11 is set to an ECONOMY contact as well as a switch 14 is set to a fresh-air intake, the car speed comes to more than the fixed speed, and in time of the relay 17 being turned to OFF, a continuous rating current to a motor 4 of a blower is cut off, making the blower come to a stop, thus it comes to air conditioner operation by means of ram air. With this constitution, reduction in energy consumption is well promotable.