In the case according to the present invention, out of the opening edges of the second channel portion that face the first channel portion, the second-side opening edge, which is the edge on the second outlet side of the first channel portion, is located nearer to the housing space than the first-side opening edge, which is the edge on the first outlet side of the first channel portion, is, and therefore water that intrudes from the first outlet is not likely to intrude into the second channel portion. In other words, water that intrudes from the first outlet is likely to be directly drained from the second outlet. Accordingly, water is smoothly drained, and the intrusion of water into the housing space is suppressed.

If the boundary between the outer wall surface of the first case body and the outer wall surface of the second case body, in which the portion serving as the second outlet is formed, is located at a lower position than the second outlet is, the intrusion of water from the second outlet is suppressed. In other words, water that intrudes from the first outlet into the first channel portion is likely to be drained from the second outlet, and water is not likely to intrude from the second outlet into the first channel portion, thus suppressing the intrusion of water into the housing space.

With a configuration in which the first channel portion includes the portion that is bent toward the second channel portion between the first outlet and the portion connected to the second channel portion, the flow of water intruding from the first outlet is moved away from the second channel portion (boundary between the first channel portion and the second channel portion) by the bent portion. In other words, water that intrudes from the first outlet into the first channel portion is even less likely to intrude into the second channel portion.