Electronic control unit

An electronic control unit that controls a rotary electric machine, the electronic control unit comprising:

• a housing including a wall defining an accommodation space, and a base extending from the wall into the accommodation space;
• a circuit board disposed on the base in the accommodation space;
• an electrical connection module disposed at a position different from the circuit board on the base in the accommodation space and electrically connected to the circuit board;
• a first connector group electrically connected to the electrical connection module;
• and
• a second connector group disposed on the wall and electrically connected to the circuit board, wherein:
• the first connector group and the second connector group are arranged in a first direction along the wall;
• the base, the electrical connection module, and the circuit board respectively have a first positioning hole, a second positioning hole, and a third positioning hole for positioning relative to each other;
• a first positioning pin is insertable into an opening of the first positioning hole through the second positioning hole;
• and
• a second positioning pin is insertable into another opening of the first positioning hole through the third positioning hole.