The invention relates to an elastic retaining member (1) for fixing a timepiece component (2) on a support element (3), comprising an opening (5) into which said support element (3) can be inserted, the retaining member (1) comprising rigid arms (6) and elastic arms (7) defined between connection areas (9) contributing to ensure elastic clamping of the support element (3) in the opening (5) each rigid arm (6) being provided with two flat contact areas (8) of the retaining member (1) able to cooperate with corresponding convex contact portions (10) of the support element (3).