Vehicle-mounted electronic device including a substrate inside a housing

Abstract

A box () has, on a rear wall surface () facing a plane where an opening () is formed, a first protrusion () which is fitted to a first notch () of a substrate () and first ribs () which support a first end of the substrate () by sandwiching the first end, and has, on two surfaces facing respective substrate surfaces of the substrate (), a hole () for each of the two surfaces. A lid () has, on a lid surface () facing the opening (), a second protrusion () fitted to a second notch () of the substrate (), a second rib (), and a third rib (), the second and third ribs supporting a second end of the substrate () by sandwiching the second end, and has, at an outer periphery, hooks () for fixing the lid () to the box () by being fitted to the holes () of the box (). The hooks () each have an inclined surface () that allows the lid () to move by a specified amount in a direction in which the lid () comes off from the box ().