A capacity control valve comprising: a valve housing (10, 11) provided with a discharge port allowing a discharge fluid of a discharge pressure (Pd) to pass therethrough, a suction port (14, 17) allowing a suction fluid of a suction pressure (Ps) to pass therethrough, and a control port (15, 16) allowing a control fluid of a control pressure (Pc) to pass therethrough; and a primary valve which includes a primary valve seat and a primary valve body (51, 54) driven by a solenoid and controls a flow of a fluid between the discharge port and the control port (15, 16) by a movement of the primary valve body (51, 54), the control port (15, 16) including a first control port and a second control port, the capacity control valve further comprising a differential CS valve which includes a differential CS valve body dividing a control pressure chamber into a discharge side control chamber and a suction side control chamber in the axial direction, the control pressure chamber communicating with the control port (15, 16), the discharge side control chamber communicating with the first control port, the suction side control chamber communicating with the second control port, characterized in that the differential CS valve body is disposed so as to be relatively movable in an axial direction with respect to the primary valve body (51, 54), wherein a spring configured to urge the differential CS valve body in a closing direction is disposed between the differential CS valve body and the primary valve body (51, 54), wherein when a differential pressure is generated as a result that a pressure in the discharge side control chamber, which acts on the differential CS valve body in the axial direction, becomes smaller than a pressure in the suction side control chamber, which acts on the differential CS valve body in the axial direction, the differential CS valve body is operated by the differential pressure against an urging force of the spring to open a communication between the second control port and the suction port, and when the pressure in the suction side control chamber, which acts on the differential Cs valve body in the axial direction, is substantially the same as the pressure in the discharge side control chamber, which acts on the differential CS valve body in the axial direction, the differential CS valve body is operated by urging force of the spring to close the communication between the second control port and the suction port. a valve housing (10, 11) provided with a discharge port allowing a discharge fluid of a discharge pressure (Pd) to pass therethrough, a suction port (14, 17) allowing a suction fluid of a suction pressure (Ps) to pass therethrough, and a control port (15, 16) allowing a control fluid of a control pressure (Pc) to pass therethrough; and a primary valve which includes a primary valve seat and a primary valve body (51, 54) driven by a solenoid and controls a flow of a fluid between the discharge port and the control port (15, 16) by a movement of the primary valve body (51, 54), the control port (15, 16) including a first control port and a second control port, the capacity control valve further comprising a differential CS valve which includes a differential CS valve body dividing a control pressure chamber into a discharge side control chamber and a suction side control chamber in the axial direction, the control pressure chamber communicating with the control port (15, 16), the discharge side control chamber communicating with the first control port, the suction side control chamber communicating with the second control port, characterized in that the differential CS valve body is disposed so as to be relatively movable in an axial direction with respect to the primary valve body (51, 54), wherein a spring configured to urge the differential CS valve body in a closing direction is disposed between the differential CS valve body and the primary valve body (51, 54), wherein when a differential pressure is generated as a result that a pressure in the discharge side control chamber, which acts on the differential CS valve body in the axial direction, becomes smaller than a pressure in the suction side control chamber, which acts on the differential CS valve body in the axial direction, the differential CS valve body is operated by the differential pressure against an urging force of the spring to open a communication between the second control port and the suction port, and when the pressure in the suction side control chamber, which acts on the differential Cs valve body in the axial direction, is substantially the same as the pressure in the discharge side control chamber, which acts on the differential CS valve body in the axial direction, the differential CS valve body is operated by urging force of the spring to close the communication between the second control port and the suction port.