ROOF SIDE RAIL ASSEMBLY FOR A VEHICLE

A roof side rail assembly for a vehicle may seal a perimeter of a roof panel in a vehicle from which the roof panel may be separated. The roof side rail assembly includes a roof side rail disposed in a longitudinal direction of the vehicle on a side surface of a roof of a vehicle and includes an auxiliary rail formed in the longitudinal direction of the vehicle, fastened to an outer side of the vehicle in a width direction at the roof side rail, and having weather strips mounted thereon to seal a gap between a roof panel mounted on the roof and a door glass.