A variable capacity type vane compressor comprising a cylinder having an oblong cylinder bore and a rotor with radial vanes rotatably inserted in the cylinder so that the radially outer ends of the vanes are in slidable contact with the cylinder bore surface to form compression chambers therebetween. A movable capacity control disk is arranged at an interface between one side plate and the rotor to control the quantity of introduced gas and/or returned compressed gas to vary a capacity of the compressor. The capacity control disk is moved by a spool actuator inserted in a spool cylinder having opposed working chambers. Gas under output pressure is introduced into the first working chamber, and oil under output pressure is introduced into the second working chamber, while a leak passage relieves the oil pressure to an intermediate pressure. A spring is also arranged in the second working chamber to urge the spool, and a valve is arranged in the oil passage close to the second working chamber to regulate the movement of the spool in response to a predetermined requirement.