To provide a timepiece movement having a mechanism in which a chronograph runner is isolated from a fly-back runner.
The timepiece movement of the fly-back chronograph type has a frame including a finishing gear train capable of being connected to a chronograph gear train. The gear train has at least one chronograph runner including a chronograph spindle intended to carry a first member for displaying seconds. The movement has a fly-back runner coaxial with the chronograph runner and having a fly-back spindle intended to carry a second member for displaying seconds. The fly-back spindle is hollow and passed through by the chronograph spindle, the fly-back runner being mounted rotationally with reference to the frame by means of a bearing. This construction makes it possible to isolate the chronograph runner from the fly-back runner.