To provide a cowl cover structure which can maintain waterproofness without increasing the number of parts.

A cowl cover member 11 is arranged at the front end 10a of a front window shield member 10 of a vehicle 1 via a fitting part 11d. At the cowl cover member 11, a general face 11c coinciding with an upper-face side opening 8a of an air box 4 extending along the vehicle width direction is formed in the vicinity of an upper surface between a front air space 2 and an occupant room 3 so as to be integrated with the fitting part 11d. Then, at the fitting part 11d of the cowl cover member 11, a downward-descending slope 11g makes an upper surface 11f having an inclination angle α toward a vehicle front smoothly communicate with an upper surface 11e of the general face 11c along a lower surface of the front edge 10a of the front window shield member 10.