The object of the present invention is to significantly improve a function for discharging a liquid refrigerant in a control chamber at the time of start-up of a variable capacity compressor by moving a center post and increasing the area of a passage for discharging the liquid refrigerant when discharging the liquid refrigerant. The present invention is characterized by including: a first valve chamber formed in the middle of the discharge-side passages 31, 32, 33; suction-side passages for providing communication between a suction chamber for sucking the fluid and the control chamber; a second valve chamber 36 and a third valve chamber 38 formed in the middle of the suction-side passages; a solenoid 60 for exerting an electromagnetic driving force for controlling a valving element 40, and in which a suction-side passage opening/closing means has a third valve portion 43 for opening and closing the suction-side passages 33, 32, 34 by receiving the pressure of the control chamber in the third valve chamber 38, and a second valve portion 42 for opening and closing the suction-side passages by receiving the electromagnetic driving force in the second valve chamber 36, and a center post 64 which is a constituent member of the solenoid is provided movably in the axial direction in such a manner that one end face thereof is opposed to the second valve portion 42, and the center post 64 is driven to the direction away from the second valve portion 42 and controlled so that the distance between the second valve portion 42 is increased when discharging the liquid refrigerant.