A device for fastening a wrist strap, in particular a watch strap, to a case, in particular to a watch case, the device having a linking member, to one end of which a strap end member of the wrist strap can be fastened and the other end of which can be fastened to a wrist strap pin attached laterally to said case. The linking member has at the bottom thereof an indentation which is appreciably elbowed in longitudinal section and opens into a groove which is suitable for receiving the wrist strap pin and is oriented transversely to the longitudinal axis of the wrist strap. A securing element, which is biased against said case and has an interlocking projection located therein, is arranged on the linking member in such a way that the securing element can assume two positions. In a first, secured position, the wrist strap pin is positioned in the groove in the linking member and the securing element prevents the linking member or the wrist strap from becoming detached from the wrist strap pin or from the case by means of the cooperation of said interlocking projection with the case. In a second, opened position, the wrist strap pin can be guided out of or into said groove.