The invention provides an air conditioner control device for a vehicle. When the dust removal mode is executed while cooling and the air volume is increased, the target temperature of the evaporator is reduced according to the increase in the air volume. Therefore, the heat taken away from the air can be increased according to the increase of the air volume. As a result, an increase in the blowing temperature can be suppressed. On the other hand, when the dust removal mode is executed during heating and the air volume is increased, the target temperature of the medium that exchanges heat with the air through the heating unit is increased in accordance with the increase in the air volume. Therefore, the amount of heat applied to the air can be increased according to the increase of the air volume. Consequently, a decrease in the blowing temperature can be suppressed. According to the above content, when the dust removal mode is used for cooling or heating, the blowing temperature can be prevented from changing according to the increase of the air volume.