A disk brake for a motor vehicle includes an internally ventilated brake disk, a brake disk nave, and radially directed bores. In the radially directed first bores the connecting means are introduced such that they extend further into radially directed second bores in the friction ring into the friction ring. The brake disk nave forms the fit with a single friction ring half and this fit has material convexities, which point inward toward the cooling channels or the ribs, at the points at which the second bores are introduced for the connecting means.