ELECTRIC OIL PUMP DEVICE

PROBLEM TO BE SOLVED: To provide an electric oil pump device capable of preventing malfunction of a control board and breakage of electronic components mounted on the control board due to static electricity intruded in a motor housing.SOLUTION: A metal dielectric member 24 extending in an axial direction is coaxially press-fitted in and fixed to a rear end face of a rotary drive shaft 7. The dielectric member 24 contactlessly penetrates a through-hole 26 provided in a control board 4, and an end face of the same extends close to a breathing hole 23 for communication between an inside and an outside of a cover 20, faces the breathing hole 23 and rotates together with the rotary drive shaft 7. The dielectric member 24 is formed to have such a tapered shape in the axial direction that a diameter of a portion contactlessly penetrating the through-hole 26 of the control board 4 is smaller than a diameter of the through-hole 26 and a diameter of a rear end axially facing the breathing hole 23 is smaller than a diameter of a front end on a rotary drive shaft 7 side.