Abstract: Gong mounting device designed to bear against a crystal (10) closing a striking-watch case. This device comprises a block (20) for immobilizing at least one end (1, 2) of a gong (T1, T2) inside the watch case, and a means (30) for mounting this block (20) on said crystal (10). The mounting means (30) is a clamping-type mounting means enabling the block (20) to exert pressure on the crystal (10).