Electric driving device, electric power steering device, and method for manufacturing electronic control unit

An electric driving device comprising a motor and an electronic control unit configured to control rotation of the motor, wherein

• the motor comprises:
• a shaft extending from a load side to an anti-load side in an axial direction;
• a motor rotor configured to synchronize with the shaft;
• a motor stator comprising a motor coil and motor coil wiring for supplying electric power to the motor coil and configured to rotate the motor rotor;
• a first housing that accommodates the motor rotor and the motor stator;
• and
• a magnet provided on the anti-load side of the shaft, and
• the electronic control unit comprises:
• a first circuit board provided with a transistor configured to output an electric current to excite the motor coil and a rotation angle sensor disposed on an extension of the axial direction of the shaft, the first circuit board being disposed on the anti-load side of the shaft;
• a second circuit board comprising a control circuit configured to control an electric current supplied to the transistor;
• a second housing that accommodates the second circuit board and has a first through hole passing through the second housing in the axial direction;
• a lid that covers the second housing;
• and
• an inter-board connector that is disposed in the first through hole and that connects the second circuit board disposed on the anti-load side of the second housing to the first circuit board disposed on the load side of the second housing such that the second housing accommodating the second circuit board is disposed between the first circuit board and the second circuit board.