a body including a body bore therein;

a cover contacting the body to close the body bore, the cover being arranged to have a concave portion therein opened at a side of the body;

a cam ring arranged to be in close contact with an inner peripheral surface of the body bore;

a cylindrical rotor incorporated inside the cam ring and arranged to be co-axial with the cam ring;

a plurality of vanes inserted into a plurality of vane grooves formed in a radial direction of the rotor;

a rotating shaft penetrating axially through the rotor, wherein the rotating shaft has one end supported by a bearing hole disposed in the concave portion and rotates by a driving force of a drive source to rotate the rotor;

a bearing supporting the rotating shaft, the bearing being disposed inside the body;

a first side plate including a central bore and fitted into the concave portion;

a bearing convex portion arranged so as to be raised from a bottom of the concave portion to form the bearing hole and fitted into the central bore of the first side plate;

a first locating pin standing from the bottom of the concave portion, penetrating through the first side plate, and inserted into the cam ring, a top end of the first locating pin being disposed within the cam ring;

a second side plate provided inside the body bore and being opposite to the first side plate so that the rotor is placed between the first side plate and the second side plate;

a high-pressure outlet portion disposed in the second side plate to send out a pressure from chambers defined by the neighboring vanes;

a pressure inlet portion disposed in the first side plate to balance pressures applied to the chambers defined by the neighboring vanes in an axial direction from both sides of the rotor; and

a second locating pin raised from the first side plate and inserted into the cam ring, wherein:

a relative position between the pressure inlet portion and the high-pressure outlet portion is maintained by the first locating pin and the second locating pin.