PURPOSE: To enable even a non-watertight type connector to be used as a connector to be left over as is within the door of an automobile.

CONSTITUTION: A rib 34 which is projected to the inside of a cabin while being extended roughly vertically with respect to a door, is integrally formed at a position around the circumferential periphery of a service hole 26 for a door inner panel 18. The apex face 34A of the rib 34 is bonded on a service hole cover with adhesives. Non-watertight type connectors 40 and 42 are disposed along the vertical direction of the door on the side opposite to the service hole 26 with respect to the rib 34. Therefore, even if rain water and the like ingress through the service hole 26, they are dammed by the rib 34, the connectors 40 and 42 thereby will never be splashed by rain water and the like.