To provide a drainage structure of a roof molding with excellent appearance capable of preventing water transferred in the vehicle width direction along a roof panel from entering the inside of a cabin when a door is opened.

This drainage structure of the roof molding 100 is arranged in a groove 104 formed along a joining part 103 between the roof panel 101 and a side body 102 of a vehicle, for covering the joining part 103. The drainage structure of the roof molding 100 includes a molding 110 extended in the vehicle longitudinal directionon and having a notch part 112 where a front end part 111 on the side opposed to the roof panel 101 is cut out, and a fixing member 120 connected to the front end of the molding 110, having an extension part 122 fitted to the cutout part 112 of the molding 110 and fixing the molding 110 to the groove 104, and the extension part 122 of the fixing member 120 forms a void 130 between the roof panel 101 and itself.