A gas burner with a burner lower part with a lower gas distribution chamber which is open at the top and a radial secondary air passage to supply secondary air to an inner region of the gas burner, and a burner upper part positioned loosely on the burner lower part and partially closing off the lower gas distribution chamber, and which includes a burner ring, in which an annular upper gas distribution chamber is configured, and which has a gas throughflow opening corresponding to the lower gas distribution chamber and connecting the lower gas distribution chamber to the upper gas distribution chamber.