The present invention has been made in the vanes located on the inside of the pump housing has a discharge port which the oil is discharged is formed in the suction port and the other side which oil is sucked into one side of the rotating while in contact with the inner periphery of the pump housing by the centrifugal force of the rotor and the rotor rotation as the structure of the vane pump,; The pump housing inner being in seated rotatably, abuts the inner peripheral surface of the pump housing facing the piece to the inside a plurality of insertion grooves are the first rotor portion and the first rotor formed portion in the radial direction position, and formed into the first rotor a plurality of groove matching to be located in the insertion groove comprising the second rotor portion formed rotor (rotor); And; Is mounted to the flow in the groove of the rotor, the phase adjacent to the second rotor unit is located inside the first rotor part, characterized by consisting of a vane (vane) step surface is formed at the lower end.
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