Motor rotor rotorAn intermediate member made of a synthetic resin is provided between the magnet and the motor shaft to couple the magnet to the motor shaftIts intermediate member andIn a fuel pump in which a metal washer is sandwiched between a relative facing surface with a bearing fixed to the pump caseEven if the bearing is formed by sintering the metal powderThe washer is held on the bearing;To rotate the intermediate member to slideAlmost no metal abrasion occurs due to the sliding rotation.The metal abrasion piece can be prevented from adversely affecting the movable portion of the fuel pump.Solution: when the friction coefficient between the washer 40 and the intermediate member 37 is assumed to be. Mu. 1, the friction coefficient between the washer 40 and the bearing 51 is set to be. Mu. 2, the outer diameter of the contact portion between the washer 40 and the intermediate member 37 is D1, and the outer diameter of the contact portion between the washer 40 and the bearing 51 is D2.A washer 40, an intermediate member 37 and a bearing 51 are formed to satisfy the relationship of D1 / D2 < μ 2 / μ 1.Diagram
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