A cowling structure is provided for a motorcycle in which a radiator is disposed behind a front wheel of the motorcycle. The cowling structure includes a main cowling and a sub cowling. The main cowling covers a periphery of the radiator from the front of a handlebar. The sub cowling is provided in the rear of the cowling through a space. The sub cowling is separate from the cowling. The cowling structure allows wind to effectively hit a radiator, and reduces a force necessary for inclining a vehicle body at the time of cornering.