A first attaching base member is fixed to a camera arranging place. A second attaching base member is attached to the first attaching base member. The first attaching base member and the second attaching base member form an internal wiring chamber for passing camera wiring therethrough. The second attaching base member is connected to the first attaching base member by a hinge portion so as to be opened and closed. Plural hinge portions are arranged so as to open and close the second attaching base member in plural directions. Thus, an attaching construction work can be easily made. Further, an external appearance image can be improved.