Abstract: A bone anchoring device includes first and second arms defining a first slot of depth p extending along an axis. The first and second arms respectively bear a first and a second branch extending outside the first slot. The first branch defining second and third slots. In the rest position: the orthogonal projection on the axis of the bottom of each of the second and third slots is in the first slot distanced from the bottom of this slot of at least 10% of p; and the distances d1 separating the second slot bottom from the part of the end of the branch defining it which is the furthest away from it, and d2 separating the third slot bottom from the part of the end of the branch defining it which is the furthest away from it, so each of d1/p and d2/p>0.3.