A capacity control valve comprising: a valve housing having a main valve seat portion formed on an inner peripheral surface thereof; a main valve body that has a main valve portion capable of seating on the main valve seat portion and is capable of blocking communication between a discharge port and a control port depending on a driving force of a solenoid; a relief valve that is opened by pressure; a first flow channel that allows the control port and a suction port to communicate with each other in a case where the relief valve is opened; a second flow channel that is formed at least partially in parallel with the first flow channel and allows the control port and the suction port to communicate with each other; and a spool valve body (252, 352) that is reciprocatably disposed in a sleeve and capable of adjusting an opening of the second flow channel depending on the driving force of the solenoid, wherein, after the main valve portion is seated on the main valve seat portion, the spool valve body (252, 352) is further moved by the driving force of the solenoid and increases the opening of the second flow channel, characterized in that the spool valve body (252, 352) is positioned at a position where the opening of the second flow channel is maintained at a minimum opening area when the main valve portion is seated on the main valve seat portion, wherein the main valve body and the spool valve body (252, 352) respectively have projections protruding in opposite radial directions and are engaged with each other by bringing the projections into contact with each other, and wherein a maximum separation distance in the axial direction between the main valve body and the spool valve body (252, 352) is set to be shorter than a distance where the spool valve body (252, 352) is movable relative to the main valve body in the axial direction. a valve housing having a main valve seat portion formed on an inner peripheral surface thereof; a main valve body that has a main valve portion capable of seating on the main valve seat portion and is capable of blocking communication between a discharge port and a control port depending on a driving force of a solenoid; a relief valve that is opened by pressure; a first flow channel that allows the control port and a suction port to communicate with each other in a case where the relief valve is opened; a second flow channel that is formed at least partially in parallel with the first flow channel and allows the control port and the suction port to communicate with each other; and a spool valve body (252, 352) that is reciprocatably disposed in a sleeve and capable of adjusting an opening of the second flow channel depending on the driving force of the solenoid, wherein, after the main valve portion is seated on the main valve seat portion, the spool valve body (252, 352) is further moved by the driving force of the solenoid and increases the opening of the second flow channel, characterized in that the spool valve body (252, 352) is positioned at a position where the opening of the second flow channel is maintained at a minimum opening area when the main valve portion is seated on the main valve seat portion, wherein the main valve body and the spool valve body (252, 352) respectively have projections protruding in opposite radial directions and are engaged with each other by bringing the projections into contact with each other, and wherein a maximum separation distance in the axial direction between the main valve body and the spool valve body (252, 352) is set to be shorter than a distance where the spool valve body (252, 352) is movable relative to the main valve body in the axial direction.