Coupling element for suspending a sliding door leaf from a roller body of a sliding door assembly, wherein said roller body for this purpose comprises a downwardly hanging shaft having a widened section at the bottom, the coupling element comprising - a fastening body for fastening the coupling element to the sliding door leaf , having a fitting cavity for fitting the shaft with its widened section into the fastening body , comprising an insertion opening through which the widened section is fittable in the fitting cavity and a shoulder which extends next to the insertion opening , underneath which shoulder the widened section is at least partially fittable via the insertion opening , in order for said widened section to engage underneath said shoulder ; - a retaining element which is arranged at the bottom of the fitting cavity in such a way that it is hingeable about a substantially horizontal hinge pin between an upper position in which it prevents the moving of the widened section in and out of the insertion opening and a lower position in which it opens the insertion opening for the insertion of the widened section ; - a resilient element which is arranged under the retaining element and exerts a force on the retaining element which pushes the retaining element into its upper position; characterized in that the coupling element further comprises - a releasing element which is displaceable between a first position in which the retaining element is hingeable about its hinge pin and a second position for retaining the retaining element in its lower position; wherein the hinge pin about which the retaining element is hingeably arranged is arranged on the side of the shoulder opposite to the insertion opening , and in that the releasing element is arranged above the retaining element and is adjustable to its first position and to its second position. - a fastening body for fastening the coupling element to the sliding door leaf , having a fitting cavity for fitting the shaft with its widened section into the fastening body , comprising an insertion opening through which the widened section is fittable in the fitting cavity and a shoulder which extends next to the insertion opening , underneath which shoulder the widened section is at least partially fittable via the insertion opening , in order for said widened section to engage underneath said shoulder ; - a retaining element which is arranged at the bottom of the fitting cavity in such a way that it is hingeable about a substantially horizontal hinge pin between an upper position in which it prevents the moving of the widened section in and out of the insertion opening and a lower position in which it opens the insertion opening for the insertion of the widened section ; - a resilient element which is arranged under the retaining element and exerts a force on the retaining element which pushes the retaining element into its upper position; characterized in that the coupling element further comprises - a releasing element which is displaceable between a first position in which the retaining element is hingeable about its hinge pin and a second position for retaining the retaining element in its lower position; <EOS>