Abstract: A drainage structure for use in a sunroof apparatus is provided including a pair of drain drips (7) respectively attached to one ends of a pair of longitudinally extending opposite guide rails (3) of the sunroof apparatus mounted on a vehicle roof (2), the pair of drain drips (7) each having a drain path portion (9) and a communication path portion (11), the respective communication path portions (11) of the pair of drain drips (7) being interconnected through a communication tube (10) and oriented toward a transversely central side of the vehicle roof (2). With this drainage structure, even when water flows from an upper one of the drain drips (7) to a lower one of the drain drips (7) due to tilting of the vehicle to the right and left, the water is less likely to flow into a lower one of the guide rails (3) and hence is prevented from leaking into the inside of the vehicle.