Variable displacement compressor

A variable displacement compressor, which includes:

• a first control valve that controls an opening degree of a pressure supply passage that causes a discharge chamber and a crank chamber to communicate with each other;
• a check valve that is interposed in the pressure supply passage downstream of the first control valve, and blocks a flow of a refrigerant from a crank chamber side to a first control valve side;
• a second control valve that controls an opening degree of a pressure release passage that releases a refrigerant pressure in the crank chamber to a suction chamber side in conjunction with the first control valve, receives a refrigerant pressure in a pressure supply passage region downstream of the first control valve and decreases the opening degree of the pressure release passage when the first control valve opens, and receives a refrigerant pressure on the crank chamber side and increases the opening degree of the pressure release passage when the first control valve closes;
• and
• a pressure relief passage that relieves a refrigerant pressure in a pressure supply passage region between the first control valve and the check valve to the suction chamber side,
• in which the variable displacement compressor controls an opening degree of the first control valve to control the refrigerant pressure in the crank chamber, and changes an inclination angle of a swash plate in the crank chamber to vary a discharge displacement,
• wherein an opening and closing means capable of opening and closing the pressure relief passage is provided.