Cowl structure of vehicle

A cowl structure of a vehicle, comprising:

• a cowl top panel that extends in a width direction of the vehicle and is coupled to a dash panel to separate an engine compartment and a passenger compartment;
• a cowl lower panel that extends in the width direction of the vehicle, is coupled to the dash panel to separate the engine compartment and the passenger compartment, and is disposed at a lower side than the cowl top panel in a vertical direction of the vehicle;
• a cowl upper supporting member having an upper portion coupled to the cowl top panel and a coupling component of the cowl top panel and the dash panel and a lower portion coupled to the cowl lower panel;
• and
• a cowl lower supporting member coupled to the cowl lower panel and the dash panel, wherein the cowl lower supporting member includes:
• a horizontal flange of a rectangular shape that extends in the width direction of the vehicle;
• and
• a side flange curved in a lower side of the vertical direction of the vehicle from an edge of the horizontal flange.