A variable displacement swash plate type compressor comprising: a housing in which a suction chamber, a discharge chamber, a swash plate chamber, and a cylinder bore (21a, 23a) are formed; a drive shaft which is rotatably supported by the housing; a swash plate capable of rotating in the swash plate chamber by rotation of the drive shaft; a link mechanism which is provided between the drive shaft and the swash plate to allow a change of the inclination angle of the swash plate with respect to the direction perpendicular to the rotational axis of the drive shaft; a pistion which is accommodated in the cylinder bore (21a, 23a) so as to be able to reciprocate in the cylinder bore; a conversion mechanism (11a, 11b) which reciprocates the piston in the cylinder bore (21a, 23a) by rotation of the swash plate and at a stroke corresponding to the inclination angle; an actuator capable of changing the inclination angle; and a control mechanism which controls the actuator, wherein the cylinder bore is configured by a first cylinder bore provided on one surface side of the swash plate, and a second cylinder bore provided on the other surface side of the swash plate, the piston includes a first head section being reciprocated in the first cylinder bore and partitioning a first compression chamber in the first cylinder bore, and a second head section being reciprocated in the second cylinder bore and partitioning a second compression chamber in the second cylinder bore, charaterised in that the link mechanism is arranged to allow the top dead center position of the first head section to be moved more than the top dead center position of the second head section according to a change of the inclination angle, the actuator is provided to be rotatable integrally with the drive shaft and is arranged on the side of the first cylinder bore with respect to the swash plate in the swash plate chamber, the actuator includes an actuator main body connected to the swash plate and configured to be movable in the rotational axis direction, and a control pressure chamber configured to move the actuator main body at the time when the internal pressure of the control pressure chamber is changed by the control mechanism, and the first cylinder bore is formed to have a diameter smaller than the diameter of the second cylinder bore. a housing in which a suction chamber, a discharge chamber, a swash plate chamber, and a cylinder bore (21a, 23a) are formed; a drive shaft which is rotatably supported by the housing; a swash plate capable of rotating in the swash plate chamber by rotation of the drive shaft; a link mechanism which is provided between the drive shaft and the swash plate to allow a change of the inclination angle of the swash plate with respect to the direction perpendicular to the rotational axis of the drive shaft; a pistion which is accommodated in the cylinder bore (21a, 23a) so as to be able to reciprocate in the cylinder bore; a conversion mechanism (11a, 11b) which reciprocates the piston in the cylinder bore (21a, 23a) by rotation of the swash plate and at a stroke corresponding to the inclination angle; an actuator capable of changing the inclination angle; and a control mechanism which controls the actuator, wherein the cylinder bore is configured by a first cylinder bore provided on one surface side of the swash plate, and a second cylinder bore provided on the other surface side of the swash plate, the piston includes a first head section being reciprocated in the first cylinder bore and partitioning a first compression chamber in the first cylinder bore, and a second head section being reciprocated in the second cylinder bore and partitioning a second compression chamber in the second cylinder bore, charaterised in that the link mechanism is arranged to allow the top dead center position of the first head section to be moved more than the top dead center position of the second head section according to a change of the inclination angle, the actuator is provided to be rotatable integrally with the drive shaft and is arranged on the side of the first cylinder bore with respect to the swash plate in the swash plate chamber, the actuator includes an actuator main body connected to the swash plate and configured to be movable in the rotational axis direction, and a control pressure chamber configured to move the actuator main body at the time when the internal pressure of the control pressure chamber is changed by the control mechanism, and the first cylinder bore is formed to have a diameter smaller than the diameter of the second cylinder bore.