An electric outboard motor that comprises an AC motor as a drive source and can be installed on a ship, the electric outboard motor comprising: an outboard motor main body that comprises the AC motor, an inverter that converts a direct current to an alternating current to supply the alternating current to the AC motor, a drive unit, an installation unit including a clamp bracket, and a steering handle; a control/power supply unit that supplies the direct current to the inverter and that is formed separately and away from the outboard motor main body and can be disposed in the ship, wherein the control/power supply unit includes a battery unit, which supplies the direct current to the inverter; and a connection cable that electrically connects the outboard motor main body and the control/power supply unit; and wherein the drive unit is positioned on the bottom side of the AC motor and converts rotational force output by the AC motor to power for driving the ship and includes a drive shaft, a drive shaft housing, a swivel bracket, a gear case, and a drive propeller, wherein the drive shaft housing is rotatably combined with the swivel bracket in the horizontal direction, so that the center of steering of the outboard motor and the center of the rotation output axis and the drive shaft of the AC motor match; and wherein the inverter and the AC motor are stacked and arranged apart from each other in the axial direction of the rotation output axis of the AC motor, wherein the inverter is arranged above and apart from the AC motor on the top side thereof through rod-like mounting bosses (701,702,703,704) mounted on a lower housing of the drive motor, so that the surface on the topside of the drive motor and the surface on the bottom side of the inverter do not touch and are separated at a predetermined interval. an outboard motor main body that comprises the AC motor, an inverter that converts a direct current to an alternating current to supply the alternating current to the AC motor, a drive unit, an installation unit including a clamp bracket, and a steering handle; a control/power supply unit that supplies the direct current to the inverter and that is formed separately and away from the outboard motor main body and can be disposed in the ship, wherein the control/power supply unit includes a battery unit, which supplies the direct current to the inverter; and a connection cable that electrically connects the outboard motor main body and the control/power supply unit; and wherein the drive unit is positioned on the bottom side of the AC motor and converts rotational force output by the AC motor to power for driving the ship and includes a drive shaft, a drive shaft housing, a swivel bracket, a gear case, and a drive propeller, wherein the drive shaft housing is rotatably combined with the swivel bracket in the horizontal direction, so that the center of steering of the outboard motor and the center of the rotation output axis and the drive shaft of the AC motor match; and wherein the inverter and the AC motor are stacked and arranged apart from each other in the axial direction of the rotation output axis of the AC motor, wherein the inverter is arranged above and apart from the AC motor on the top side thereof through rod-like mounting bosses (701,702,703,704) mounted on a lower housing of the drive motor, so that the surface on the topside of the drive motor and the surface on the bottom side of the inverter do not touch and are separated at a predetermined interval.