A capacity control valve comprising: a valve housing provided with a suction port (13, 14) through which a suction fluid of suction pressure (Ps) passes, and a control port through which a control fluid of control pressure (Pc) passes; a pressure drive portion including a bellows core that is housed in a pressure drive chamber formed inside the valve housing so as to communicate the suction port (13, 14), that is formed to be extendable and contractible in an axial direction, and that receives a force in a contracting direction from the suction fluid, the contracting direction being a direction in which the pressure drive portion is contractable; and a main valve formed by a valve element that receives a force in a valve opening direction of the main valve from the pressure drive portion, and a valve seat with and from which the valve element is brought into contact and separated, wherein the valve element is arranged to receive a force in a valve closing direction of the main valve from the control fluid, the pressure drive portion further includes a coil spring that is housed inside the bellows core, and that is configured to bias the bellows core at all times in a direction in which the bellows core is extended in the axial direction, the valve housing is formed to pass through in the axial direction, and a filter covers and fits onto a leading end portion of the valve housing, characterized in that an opening portion formed to pass through an end surface of the filter forms the control port, a tubular cap is fitted into the leading end portion of the valve housing, in an inner peripheral portion of this cap, a spring that retains and biases the valve element in the valve closing direction is provided, the control port is open at a position out of the axis of the main valve, and a tapered leading end portion of the cap faces on the inside of the control port. a valve housing provided with a suction port (13, 14) through which a suction fluid of suction pressure (Ps) passes, and a control port through which a control fluid of control pressure (Pc) passes; a pressure drive portion including a bellows core that is housed in a pressure drive chamber formed inside the valve housing so as to communicate the suction port (13, 14), that is formed to be extendable and contractible in an axial direction, and that receives a force in a contracting direction from the suction fluid, the contracting direction being a direction in which the pressure drive portion is contractable; and a main valve formed by a valve element that receives a force in a valve opening direction of the main valve from the pressure drive portion, and a valve seat with and from which the valve element is brought into contact and separated, wherein the valve element is arranged to receive a force in a valve closing direction of the main valve from the control fluid, the pressure drive portion further includes a coil spring that is housed inside the bellows core, and that is configured to bias the bellows core at all times in a direction in which the bellows core is extended in the axial direction, the valve housing is formed to pass through in the axial direction, and a filter covers and fits onto a leading end portion of the valve housing, characterized in that an opening portion formed to pass through an end surface of the filter forms the control port, a tubular cap is fitted into the leading end portion of the valve housing, in an inner peripheral portion of this cap, a spring that retains and biases the valve element in the valve closing direction is provided, the control port is open at a position out of the axis of the main valve, and a tapered leading end portion of the cap faces on the inside of the control port.