into contact with the cover 30 the cover 30 includes a surface 30 a that contacts the first surface 50 h or the second surface 50 i where the wide portions 50 b to 50 d are located in a vehicle air conditioner the above compressor has the discharge chamber 5 b which is shown in fig1 connected to a condenser the condenser is connected by an expansion valve to an evaporator and the evaporator is connected to the suction chamber 5 a when the drive shaft 11 is driven and rotated by an engine or the like the refrigerant in the suction chamber 5 a is compressed in the compression chambers 31 and discharged to the discharge chamber 5 b with a displacement corresponding to the tilt angle of the swash plate 17 during this operation for example when the vehicle is accelerated and the pwm control increases the opening degree between the valve seat vs and the valve body vb shown in fig2 high pressure refrigerant gas is easily supplied in from the discharge chamber 5 b to the crank chamber 9 through the discharge port 4 f the shaft hole 4 e the valve chamber 4 b and the crank port 4 d this decreases the displacement.