OIL PUMP

The present invention provides an oil pump for sucking and discharging oil, the oil pump comprising: a housing part; a stator part accommodated in the housing part and including an outer ring forminga variable chamber in which oil is introduced between the housing part and the stator part, and a main pressing end protruding outward from an outer peripheral surface of the outer ring; a rotor partaccommodated in the outer ring and configured to suck and discharge oil through rotation; a spring part including a main spring pressurizing the stator part, and configured to allow the outer ring tobe movably supported in the housing part; a guiding part installed on the outer peripheral surface of the outer ring, slidably installed in a first guiding groove formed on an inner wall of the housing part, and configured to guide the movement of the outer ring, the guiding part including a first guiding member for guiding the movement of the outer ring as the outer ring is pressed by the oil introduced into the variable c