Aiming: A housing (1) of an electronic control unit, comprising a circuit board (3), a housing member (4) for holding the circuit board (3) having an opening on the one end side of the circuit board (3), and an electrical connector, which has a plurality of contacts (22) electrically connected to the printed circuit board (3) and which is provided with the front end side and extends away from the opening exposed to the outside of the housing element (4), characterized in that the electrical connector (2) a seal member connected to the opening, the seal member having an upper groove (24a) formed on a surface side of the circuit board (3) and a lower groove (24b) closer to the front end side of the electrical connector (2 ) is arranged as the upper groove (24a).
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