Patent ID: 7257003

Claim:
An electronic unit casing, comprising: a base portion on which an electronic unit is disposed, that cools the electronic unit; a side wall that is erected on the base portion so as to surround the electronic unit and adopts a plural-layer structure comprising a metal inner wall and a heat insulating outer wall; a lid that is fixed to an upper end of the side wall with a tightening jig and includes an electromagnetic wave shielding material at least partially exposed at a surface facing opposite the side wall; and a gasket held between the lid and the upper end of the side wall, wherein: the metal inner wall comprises an exposed portion exposed at the upper end of the side wall; and the gasket comprises a metal plate in a ring shape, a first elastic seal unit that presses one surface of the metal plate against the exposed portion and seals a gap formed between the lid and the metal plate when the tightening jig is tightened, and a second elastic seal unit that presses another surface of the metal plate toward the electromagnetic wave shield material exposed at the lid and seals a gap formed between the metal plate and the upper end of the side wall when the tightening jig is tightened.