Patent ID: 7791888

Claim:
An electronic control apparatus comprising: a housing that is made of an insulating resin and has a pair of opening portions at opposite ends thereof, respectively; a heat sink that is attached to one end of said housing; a power device that is mounted on said heat sink; a circuit board that is arranged in opposition to said heat sink, and has an electronic circuit including a control circuit for controlling said power device; and a plurality of conductive plates that have their basal portions held by said housing and electrically connect said circuit board and said power device to each other; wherein the heat sink is composed of a heat sink main body, and an insulating film that is formed at least on a surface of said heat sink main body at a side at which said power device is mounted thereon; wherein said heat sink main body has outer peripheral end faces arranged in opposition to inner wall surfaces of one of said opening portions of said housing; wherein said heat sink main body has a first pair of opposite outer peripheral end faces, and a second pair of opposite outer peripheral end faces, which have said insulating film formed thereon, wherein a groove is formed between the insulating film formed on the second pair of opposite outer peripheral end faces of said heat sink main body and the inner wall surfaces of one of said opening portions of said housing, and a first adhesive resin is filled into said groove, and wherein said first adhesive resin is filled into said groove between said first pair of opposite outer peripheral end faces of said heat sink main body and said inner wall surfaces of one of said opening portions of said housing.