Patent ID: 8420966

Claim:
An electronic control apparatus comprising: a hollow housing with an opening and a bottom, the bottom having a first inner surface located inside the housing and a first outer surface opposite to the first inner surface; a lid that covers the opening of the housing to form closed space defined by the lid and the housing, the lid having a second inner surface located facing the first inner surface and a second outer surface opposite to the second inner surface; a fastener that fixes the lid to the housing; and a controller located in the space, wherein one of the first outer surface and the second outer surface is provided with an isolation member, the one of the first outer surface and the second outer surface has a liquid drip area where liquid is expected to drip, the isolation member causes the liquid dripped on the liquid drip area to flow down the one of the first outer surface and the second outer surface in a predetermined flow direction in such a manner that the liquid avoids the fastener, the isolation member has a flow path portion located between the liquid drip area and the fastener, the flow path portion projects from the one of the first outer surface and the second outer surface in a direction perpendicular to the one of the first outer surface and the second outer surface, and a first end of the flow path portion is located above a second end of the flow path portion in the flow direction, wherein the fastener comprises a plurality of fasteners, and a first number of the plurality of fasteners is located above the flow path portion in the flow direction, a second number of the plurality of fasteners is located below the flow path portion in the flow direction, and the second number is greater than the first number.