ATTACHMENT STRUCTURE OF VEHICULAR MODULE TO CEILING OF VEHICLE CABIN

An attachment structure of a vehicular module to a ceiling of a vehicle cabin of a vehicle includes a design member. The design member is configured to attach, to the ceiling, the module including an in-cabin sensor configured to perform detection in the vehicle cabin, and includes a securing portion configured to be secured to a vehicle-body ceiling member of the vehicle or an interior ceiling member disposed on a vehicle cabin side of the vehicle-body ceiling member, a downward protrusion protruding downward from the securing portion, and a design constituent extending from the downward protrusion and covering the securing portion. In an accommodating space defined between the downward protrusion and the design constituent, the in-cabin sensor is supported by the design member in such a manner that, above the accommodating space, a gap is left between the in-cabin sensor and the vehicle-body ceiling member or the interior ceiling member.