The striking work device of a timepiece includes a gong (4) surrounding a movement and extending in approximately one plane, and a gong-carrier secured to a watch plate of the timepiece. The gong is fixed to the gong-carrier. At least one hammer (6) of the striking work device strikes an impact surface (8) of the gong (4) to cause the gong to vibrate. The surface (8) of the gong, which the hammer strikes, is inclined relative to the normal to the one plane.