Patent ID: 8854827

Claim:
An electronic control unit comprising: an electronic circuit board on which electronic components are mounted; and a case for housing the electronic circuit board; wherein the case is composed of two case members fitted together and has a configuration in which a rail-shaped convex portion of a first case member is fitted to a groove-shaped concave portion of a second case member, and both case members are bonded and assembled by an adhesive between the rail-shaped convex portion of the first case member and the groove-shaped concave portion of the second case member; and moreover, the case is configured in such a way that the groove-shaped concave portion of the second case member includes a first concave portion, in which a groove width at a bottom surface side is narrow, and a second concave portion, in which a groove width at an aperture surface side is wide; and the first concave portion and the second concave portion are linked by an inclined step portion in which a groove width at the step portion is increased in a direction from the bottom surface side to the aperture surface side; and a tip of the rail-shaped convex portion of the first case member is fitted into the first concave portion at the bottom surface side of the second case member.