A valve element disposed in the valve chamber of a control valve body of a control valve for variable capacity compressors performs opening and closing operations by a plunger. The upper end of the valve element of this control valve body is inserted in the pressure chamber, while the lower end of the valve element is inserted in the plunger chamber of the solenoid excitation part. And the plunger chamber and the pressure chamber communicate with each other through a cancel hole formed in this valve element.