A first roof extends over and covers an area above an aperture through which an input connector is accessible, so as to receive water drops flowing down along a side surface of a case. A first reinforcement reinforces a fixture by which the case is fixed to a fixed surface. The first roof and the first reinforcement are a single piece of material. Thus, since the first roof and the first reinforcement are the single piece of material, if the first roof is provided to the case, there is no need to form the first roof and the first reinforcement separately. Therefore, it is possible to prevent generation of additional mold production cost and material cost for the first roof.