A variable displacement swash plate compressor comprising: a housing including a suction chamber (27a, 27b), a discharge chamber (29a, 29b), a swash plate chamber, and a cylinder bore (21a, 23a); a drive shaft supported to be rotatable in the housing; a swash plate that is rotatable in the swash plate chamber when the drive shaft rotates; a link mechanism arranged between the drive shaft and the swash plate, wherein the link mechanism allows an inclination angle of the swash plate to be changed relative to a direction orthogonal to a rotation axis of the drive shaft; a piston reciprocated in the cylinder bore; a conversion mechanism (11a, 11b) that reciprocates the piston in the cylinder bore with a stroke corresponding to the inclination angle when the swash plate rotates; an actuator capable of changing the inclination angle; and a control mechanism that controls the actuator, wherein the actuator is arranged in the swash plate chamber to be rotatable integrally with the drive shaft, the actuator includes a movable body coupled to the swash plate, a fixed body fixed to the drive shaft, and a control pressure chamber defined by the movable body and the fixed body, the drive shaft is inserted into the movable body to allow movement of the movable body in an axial direction, and the actuator is configured to move the movable body with an interior pressure of the control pressure chamber, characterized in that the movable body includes a circumferential wall that extends in a direction along the rotational axis and surrounds the fixed body, the fixed body includes a main body portion, and a guide portion that projects in the direction along the rotational axis toward the swash plate from the main body portion and extends along an inner surface of the circumferential wall, and the movable body contacts the guide portion to restrict inclination of the movable body relative to the drive shaft that is greater than or equal to a predetermined amount. a housing including a suction chamber (27a, 27b), a discharge chamber (29a, 29b), a swash plate chamber, and a cylinder bore (21a, 23a); a drive shaft supported to be rotatable in the housing; a swash plate that is rotatable in the swash plate chamber when the drive shaft rotates; a link mechanism arranged between the drive shaft and the swash plate, wherein the link mechanism allows an inclination angle of the swash plate to be changed relative to a direction orthogonal to a rotation axis of the drive shaft; a piston reciprocated in the cylinder bore; a conversion mechanism (11a, 11b) that reciprocates the piston in the cylinder bore with a stroke corresponding to the inclination angle when the swash plate rotates; an actuator capable of changing the inclination angle; and a control mechanism that controls the actuator, wherein the actuator is arranged in the swash plate chamber to be rotatable integrally with the drive shaft, the actuator includes a movable body coupled to the swash plate, a fixed body fixed to the drive shaft, and a control pressure chamber defined by the movable body and the fixed body, the drive shaft is inserted into the movable body to allow movement of the movable body in an axial direction, and the actuator is configured to move the movable body with an interior pressure of the control pressure chamber, characterized in that the movable body includes a circumferential wall that extends in a direction along the rotational axis and surrounds the fixed body, the fixed body includes a main body portion, and a guide portion that projects in the direction along the rotational axis toward the swash plate from the main body portion and extends along an inner surface of the circumferential wall, and the movable body contacts the guide portion to restrict inclination of the movable body relative to the drive shaft that is greater than or equal to a predetermined amount.