The invention concerns a box including a device for retaining in position a timepiece component. The device includes: —a base (2); —a support (3, 4) comprising a first part (3) and a second part (4), the first part being mounted to be mobile relative to the second part; —a first contact element (3a, 3b) intended to come to bear against the timepiece component, the first contact element (3a, 3b) being mounted on the first part, and a second contact element (4a) intended to come to bear against the timepiece component (5), the second contact element (4a) being mounted on the second part (4); and —a control member (1) mounted to pivot on the base (2) about a first axis (1a) on the one hand and pivoting the first part about a second axis (1b) on the other hand.