A capacity control valve comprising: a valve housing provided with a suction port, a discharge port and a control port in use communicating with a suction chamber, a discharge chamber and a control chamber of a variable displacement compressor, respectively; a valve body which is disposed inside the valve housing so as to be movable in a reciprocating manner; an urging member that urges the valve body in one direction; a drive device which is connected to the valve housing and applies a drive force to the valve body; and, the urging member being a valve seat member in the form of a pressure sensitive body provided with a bellows which has one end fixed to a partition adjustment member of the valve housing and the other end forming a free end and an adapter which is fixed to the other end of the bellows, and configured for applying an urging force to the valve body in a direction resisting a drive force, wherein the drive device includes a sleeve of which one end portion is closed, a cylindrical fixed iron core of which at least a part is disposed inside the sleeve, a movable iron core which is disposed inside the one end of the sleeve and which has an inner space, a drive rod which is disposed inside the fixed iron core so as to be movable in a reciprocating manner and of which a first end is connected to the valve body and a second end is connected to the movable iron core, and a coil portion that applies an electromagnetic drive force to the movable iron core, wherein the valve body is formed in a cylindrical shape, having an inner space capable of communicating with the suction port and is connected to the drive rod in a state in which the drive rod is inserted to an inside of the valve body, characterised in that the drive rod includes a guide portion which faces an inner peripheral surface of the fixed iron core such that a movement of the drive rod is guided in an axial direction and a groove portion which is recessed in an inward radial direction from the guide portion, in that the groove portion is continuously formed from the inner space of the valve body to the inner space of the movable iron core so as to cause the inner spaces (55, S4) communicate with each other, in that the inner space of the valve body, on one end of the drive rod, communicates with the suction port through the groove portion, and the inner space of the valve body, on one end of the adapter, is capable of communicating with an outer circumferential space of the bellows, and in that the outer circumferential space of the bellows communicates with the control port and is capable of communicating with the discharge port. a valve housing provided with a suction port, a discharge port and a control port in use communicating with a suction chamber, a discharge chamber and a control chamber of a variable displacement compressor, respectively; a valve body which is disposed inside the valve housing so as to be movable in a reciprocating manner; an urging member that urges the valve body in one direction; a drive device which is connected to the valve housing and applies a drive force to the valve body; and, the urging member being a valve seat member in the form of a pressure sensitive body provided with a bellows which has one end fixed to a partition adjustment member of the valve housing and the other end forming a free end and an adapter which is fixed to the other end of the bellows, and configured for applying an urging force to the valve body in a direction resisting a drive force, wherein the drive device includes a sleeve of which one end portion is closed, a cylindrical fixed iron core of which at least a part is disposed inside the sleeve, a movable iron core which is disposed inside the one end of the sleeve and which has an inner space, a drive rod which is disposed inside the fixed iron core so as to be movable in a reciprocating manner and of which a first end is connected to the valve body and a second end is connected to the movable iron core, and a coil portion that applies an electromagnetic drive force to the movable iron core, wherein the valve body is formed in a cylindrical shape, having an inner space capable of communicating with the suction port and is connected to the drive rod in a state in which the drive rod is inserted to an inside of the valve body, characterised in that the drive rod includes a guide portion which faces an inner peripheral surface of the fixed iron core such that a movement of the drive rod is guided in an axial direction and a groove portion which is recessed in an inward radial direction from the guide portion, in that the groove portion is continuously formed from the inner space of the valve body to the inner space of the movable iron core so as to cause the inner spaces (55, S4) communicate with each other, in that the inner space of the valve body, on one end of the drive rod, communicates with the suction port through the groove portion, and the inner space of the valve body, on one end of the adapter, is capable of communicating with an outer circumferential space of the bellows, and in that the outer circumferential space of the bellows communicates with the control port and is capable of communicating with the discharge port.