An electric power steering device, comprising: a motor; and a control unit provided on a non-output side in an axial direction of an output shaft of the motor to be integrated with the motor, the control unit including: a power module including a plurality of switching elements configured to supply current to motor windings of the motor; a control board configured to output a control signal to each of the plurality of switching elements; a heat sink, to which the power module is mounted, and is configured to release heat generated in the plurality of switching elements; a housing forming an outer case of the control unit; a power supply connector; and a signal connector, wherein the control board is provided in parallel to the axial direction of the output shaft, wherein a projection is formed at a bottom portion on the non-output side of the housing so as to protrude to the non-output side, wherein a non-output side end portion of the control board is inserted into the projection, wherein the power supply connector and the signal connector are provided in a region of an outer wall surface of the bottom portion other than the projection, wherein a hole is formed to pass through the bottom portion, wherein an extension terminal (12b, 13b) extending from a contact pin (12a, 13a) of at least one connector out of the power supply connector and the signal connector, and each of relay terminals (14a, 14b, 14c) to be connected to the extension terminal (12b, 13b), which extend from the control board and the power module, are led out to the non-output side through the hole and connected to each other, and wherein the projection, the hole, and the at least one connector are each formed linearly, and arranged in this order in parallel to one another in a direction orthogonal to a length direction of the projection. a motor; and a control unit provided on a non-output side in an axial direction of an output shaft of the motor to be integrated with the motor, the control unit including: a power module including a plurality of switching elements configured to supply current to motor windings of the motor; a control board configured to output a control signal to each of the plurality of switching elements; a heat sink, to which the power module is mounted, and is configured to release heat generated in the plurality of switching elements; a housing forming an outer case of the control unit; a power supply connector; and a signal connector, a power module including a plurality of switching elements configured to supply current to motor windings of the motor; a control board configured to output a control signal to each of the plurality of switching elements; a heat sink, to which the power module is mounted, and is configured to release heat generated in the plurality of switching elements; a housing forming an outer case of the control unit; a power supply connector; and a signal connector, wherein the control board is provided in parallel to the axial direction of the output shaft, wherein a projection is formed at a bottom portion on the non-output side of the housing so as to protrude to the non-output side, wherein a non-output side end portion of the control board is inserted into the projection, wherein the power supply connector and the signal connector are provided in a region of an outer wall surface of the bottom portion other than the projection, wherein a hole is formed to pass through the bottom portion, wherein an extension terminal (12b, 13b) extending from a contact pin (12a, 13a) of at least one connector out of the power supply connector and the signal connector, and each of relay terminals (14a, 14b, 14c) to be connected to the extension terminal (12b, 13b), which extend from the control board and the power module, are led out to the non-output side through the hole and connected to each other, and wherein the projection, the hole, and the at least one connector are each formed linearly, and arranged in this order in parallel to one another in a direction orthogonal to a length direction of the projection.