A control valve (1, 201, 301) for a variable displacement compressor for varying a discharging capacity of the compressor for compressing refrigerant led into a suction chamber and discharging the compressed refrigerant from a discharge chamber, by regulating a flow rate or pressure of at least one of the refrigerant led into a crankcase from the discharge chamber and the refrigerant led out to the suction chamber from the crankcase, the control valve (1, 201, 301) comprising: a body (5, 46, 56, 58, 205, 305) in which provided are a main valve for opening and closing a main passage, which communicates between the discharge chamber and the crank case, and a sub-valve for opening and closing a sub-passage, which communicates between the crankcase and the suction chamber; a valve seat forming section (36, 236, 350) configured to be slidably supported by the body (5, 46, 56, 58, 205, 305), the valve seat forming section (36, 236, 350) being formed integrally with a main valve seat; a main valve element (30, 330) configured to open and close a main valve by touching and leaving the main valve seat; a sub-valve seat formed integrally with the body (5, 46, 56, 58, 205, 305); a sub-valve element (36, 236, 336) configured to open and close a sub-valve by touching and leaving the sub-valve seat; a pressure-sensing section configured to sense a predetermined pressure-to-be-sensed and configured to generate a drive force exerted in an opening direction of the main valve in accordance with a magnitude of the pressure-to-be-sensed; and a solenoid configured to generate a drive force in a closing direction of the main valve in accordance with an amount of current supplied; wherein the pressure-sensing section is provided on one side of the main valve element (30, 330), and the solenoid is provided on the other side thereof, and wherein the configuration is such that after the main valve element (30, 330) has seated on the main valve seat the main valve element (30, 330) is displaceable integrally with the valve seat forming section (36, 236, 350) while the main valve being closed. a body (5, 46, 56, 58, 205, 305) in which provided are a main valve for opening and closing a main passage, which communicates between the discharge chamber and the crank case, and a sub-valve for opening and closing a sub-passage, which communicates between the crankcase and the suction chamber; a valve seat forming section (36, 236, 350) configured to be slidably supported by the body (5, 46, 56, 58, 205, 305), the valve seat forming section (36, 236, 350) being formed integrally with a main valve seat; a main valve element (30, 330) configured to open and close a main valve by touching and leaving the main valve seat; a sub-valve seat formed integrally with the body (5, 46, 56, 58, 205, 305); a sub-valve element (36, 236, 336) configured to open and close a sub-valve by touching and leaving the sub-valve seat; a pressure-sensing section configured to sense a predetermined pressure-to-be-sensed and configured to generate a drive force exerted in an opening direction of the main valve in accordance with a magnitude of the pressure-to-be-sensed; and a solenoid configured to generate a drive force in a closing direction of the main valve in accordance with an amount of current supplied; wherein the pressure-sensing section is provided on one side of the main valve element (30, 330), and the solenoid is provided on the other side thereof, and wherein the configuration is such that after the main valve element (30, 330) has seated on the main valve seat the main valve element (30, 330) is displaceable integrally with the valve seat forming section (36, 236, 350) while the main valve being closed.