An electric pump, comprising: a motor unit including a stator, a rotor core disposed inside the stator, and a shaft coupled to the rotor core; a pump unit including an internal rotor coupled to the shaft and having an external lob formed thereon and an external rotor disposed outside the internal rotor and having an internal lob forme4d to be engaged with the external lob; a housing unit including a motor housing including the motor unit and a pump housing connected to the motor housing and having a pump accommodating part, in which the pump unit is inserted, formed therein; and a cover unit coupled to the housing unit to cover the pump accommodating part, wherein an inlet port and an outlet port are formed in a bottom face of the pump accommodating part and an inner face of the cover unit, and the inlet port and the outlet port are separated to each other using an inner circumference surface and an outer circumference surface acting as a boundary in the radial direction, characterized in that an inner diameter of the inlet port based on the inner circumference surface is less than a diameter of a dedendum circle of the internal rotor, and an outer diameter of the inlet port based on the outer circumference surface is greater than a diameter of a dedendum circle of the external rotor, wherein an inner diameter of the outlet port is the same as the diameter of a dedendum circle of the internal rotor, wherein an outer diameter of the outlet port is the same as the diameter of a dedendum circle of the external rotor, wherein an inner diameter of the inlet port is less than the inner diameter of the outlet port, wherein an outer diameter of the inlet port is greater than the outer diameter of the outlet port. a motor unit including a stator, a rotor core disposed inside the stator, and a shaft coupled to the rotor core; a pump unit including an internal rotor coupled to the shaft and having an external lob formed thereon and an external rotor disposed outside the internal rotor and having an internal lob forme4d to be engaged with the external lob; a housing unit including a motor housing including the motor unit and a pump housing connected to the motor housing and having a pump accommodating part, in which the pump unit is inserted, formed therein; and a cover unit coupled to the housing unit to cover the pump accommodating part, wherein an inlet port and an outlet port are formed in a bottom face of the pump accommodating part and an inner face of the cover unit, and the inlet port and the outlet port are separated to each other using an inner circumference surface and an outer circumference surface acting as a boundary in the radial direction, characterized in that an inner diameter of the inlet port based on the inner circumference surface is less than a diameter of a dedendum circle of the internal rotor, and an outer diameter of the inlet port based on the outer circumference surface is greater than a diameter of a dedendum circle of the external rotor, wherein an inner diameter of the outlet port is the same as the diameter of a dedendum circle of the internal rotor, wherein an outer diameter of the outlet port is the same as the diameter of a dedendum circle of the external rotor, wherein an inner diameter of the inlet port is less than the inner diameter of the outlet port, wherein an outer diameter of the inlet port is greater than the outer diameter of the outlet port.