A vehicle sun roof fastening device, particularly for convertible vehicles, wherein a lever is fitted with a hinged latch element designed to mate with a fixed connecting element, and is hinged to a support so as to oscillate in relation to the support and by virtue of a crank mechanism interposed between the lever and the support and operated by a linear actuator, the output rod of which is connected to one end of a crank having the other end angularly integral with a crank (14) on the crank mechanism.